These are the changes to the original 2nd edition rulebooks that are common to both books (page numbers refer to the Europe Rulebook). I have not included any changes that were only for typos (spelling, capitalization, etc.).
Page 13, Phase 2: Combat Move, paragraph 3, bullet point 4: “Sea Units moving into a sea zone containing only enemy submarines and/or transports in order to attack those units.”
Page 13, Phase 2: Combat Move, paragraph 8: “However, if you choose to make such an attack with a unit, that unit must end its movement in that sea zone, and it must attack all such units present.”
Page 14, Sea Units Starting in Hostile Sea Zones, paragraph 3: “Once these sea units have moved and/or participated in combat, they cannot move or participate in the Noncombat Move phase of the turn.”
Page 15, Aircraft Carriers, paragraph 2: “Guest aircraft belonging to a friendly power on board another power’s carrier must remain on board as cargo if the carrier moves in combat.”
Page 16, Scramble, paragraph 2: Add to end: “Air units belonging to powers friendly to the attacked power may be scrambled by their owner if the owning power is at war with the attacking power, so long as the limit of 3 total air units is respected.â€
Page 18, Amphibious Assaults, Step 1. Sea Combat, paragraph 2: "If sea combat occurs, all attacking and defending sea and air units present must participate in the battle.â€
Page 18, Amphibious Assaults, Step 2. Battleship & Cruiser Bombardment, paragraph 1: "The number of ships that can make bombardment attacks is limited to 1 ship per land unit being offloaded from the transports into that coastal territory.â€
Page 18, Amphibious Assaults, Step 3. Land Combat, paragraph 1: “Land combat can only take place if there was no sea battle or the sea zone has been cleared of all defending enemy units except transports and submarines that submerged during the sea battle. If the attacker still has land units committed to the coastal territory, move all attacking and defending units to the battle strip and conduct combat using the General Combat rules (see below).”
Page 18, Amphibious Assaults, Step 3. Land Combat, paragraph 5: “They can only retreat to a territory from which at least one of them entered the contested territory and must all retreat at the same time and to the same place.”
Page 18, General Combat, paragraph 1: “In this step, you resolve combat in each space that contains your units and either contains enemy units or is enemy-controlled.”
Page 19, Step 1. Place Units Along the Battle Strip, paragraph 3: “Cargo doesn’t roll for hits, nor can it be chosen as a casualty.”
Page 20, Step 6. Press Attack or Retreat, Condition A, paragraph 2: “If a power has combat units remaining along the battle strip, that power wins the combat.”
Page 20, Step 6. Press Attack or Retreat, Condition A, paragraph 1: “Once all units that can either fire at a valid target or retreat on one or both sides have been destroyed, the combat ends.”
Page 20, Step 6. Press Attack or Retreat, Condition B, paragraph 1: “Move all attacking land and sea units in that combat that are along the battle strip to a single adjacent friendly space from or through which at least 1 of the original attacking land or sea units moved.”
Page 21, Multinational Forces, paragraph 4: “An attacking land unit can assault a coastal territory from an ally’s transport, but only on the turn of the attacking land unit’s owner. All of the normal requirements for transports offloading in a sea zone must still be met by the attacking power (see “Special Combat Movement, Transportsâ€, page 16), and any scrambled air units will prevent the landing if they cannot be destroyed.”
Page 21, Multinational Forces, Transporting Multinational Forces, bullet point 2: “The transport’s owner moves it (or not) on that power’s turn.”
Page 23, Phase 5: Mobilize New Units, paragraph 1: “If you purchased new units, you must now move all of them from the Mobilization Zone on the game board to eligible spaces you have controlled since the start of your turn.”
Page 29, Antiaircraft Artillery, Air Defense, paragraph 1: “In other words, the total number of air defense dice rolled is either 3 times the number of AAA units, or the number of attacking air units, whichever is the lesser.
Page 31, Aircraft Carriers, Carry Aircraft, paragraph 3: “Any air units that are not in an eligible landing space by the end of the Noncombat Move phase are destroyed (note that this can include a sea zone in which a new carrier will be placed during the Mobilize New Units phase is an eligible landing space).â€
Page 32, Submarines, Surprise Strike: “As detailed in step 2 of the General Combat sequence (page 18), submarines make their rolls before any other units, unless an enemy destroyer is present in the battle.”
Page 32, Transports, No Combat Value: “Transports may not attack in a sea battle without being accompanied by at least 1 unit with an attack value~~, unless they are conducting an amphibious assault from a friendly sea zone that is free of enemy submarines~~.”
Page 33, Transports, Chosen Last: “For example, air units attacking transports and submarines will hit the transports because they cannot hit the submarines without an attacking destroyer present.”
Page 33, Transports, Loading and Offloading, paragraph 3: “Land units belonging to friendly powers must load on their owner’s turn, be carried on your turn, and offload on a later turn of their owner.”
Page 33, Amphibious Assaults, paragraph 2: “It can also offload any number of units owned by the attacking power that were already on board at the start of the turn.”
Page 33, How the War Is Won, paragraph 1: “The Axis wins the game by controlling either any 8 victory cities on the Europe map or any 6 victory cities on the Pacific map for a complete round of play (ending with the next turn of the Axis power that captured the final required city), as long as they control an Axis capital (Berlin, Rome, or Tokyo) at the end of that round.”
Page 33, How the War Is Won, paragraph 2: “The Allies win by controlling Berlin, Rome, and Tokyo for a complete round of play (ending with the next turn of the Allied power that captured the third capital), as long as they control an Allied capital (Washington, London, Paris, or Moscow) at the end of that round.”
Page 34, Global United Kingdom Rules, Mobilize New Units: “United Kingdom mobilizes its new combat units purchased by each economy at industrial complexes that fall under that economy. It mobilizes its new facilities purchased by each economy in territories that fall under that economy.”
Page 35, Movement Between Maps, paragraph 2: “The Canadian territory of Alberta/Saskatchewan/Manitoba on the Europe map is adjacent to the Western Canada territory on the Pacific map.â€
Page 36, Political Situation, National Objectives, and Bonus Income, Soviet Union, Political Situation, paragraph 2: “As a result, if the Soviet Union is at war with Axis powers on only one map, it is still under the restrictions of being a neutral power (see “Powers Not at War with One Another,†page 15) on the other map, and Axis powers on the other map are also still under those restrictions regarding the Soviet Union on both maps. For example, a state of war with only Japan lifts the neutrality restrictions from the Soviet Union on the Pacific map only, and allows Japanese units to attack or fly over Soviet-controlled territories on either map. However, the Soviet Union is still restricted on the Europe map, and Germany and Italy must still treat the entire Soviet Union as a neutral power, and may not move units into or through any original Soviet territories or Soviet-controlled territories. At the same time, Allied powers may move units into or through Pacific original Soviet territories and Soviet-controlled territories, but not European ones.”
Page 36, Political Situation, National Objectives, and Bonus Income, Soviet Union, bullet point 2: “3 IPCs for each original German, Italian, or pro-Axis neutral territory that the Soviet Union controls that was originally German, Italian, or pro-Axis neutral.â€
Page 38, Political Situation, National Objectives, and Bonus Income, United Kingdom: “It may, however, move units into Dutch territories as a noncombat movement at any time, as long as they have not yet been captured by an Axis power. It may actually take control of Dutch territories (gaining their IPC income) by moving land units into them as a noncombat movement, as long as they have not yet been captured by an Axis power. Additionally, the United Kingdom considers attacks against any Dutch territories to be acts of war against it directly. ~~Once a Dutch territory has been captured by an Axis power, however, it may be captured and controlled by any power.~~â€
Page 38, United Kingdom, National Objective and Bonus Income, paragraph 1: “To reflect this objective, the United Kingdom Europe and Pacific economies (see “Global United Kingdom Rules”, page 35) collect bonus IPC income during each of the United Kingdom’s Collect Income phases in the following situations.”
Page 39, Political Situation, National Objectives, and Bonus Income, ANZAC: “It may, however, move units into Dutch territories as a noncombat movement at any time, as long as they have not yet been captured by an Axis power. It may actually take control of Dutch territories (gaining their IPC income) by moving land units into them as a noncombat movement, as long as they have not yet been captured by an Axis power.â€
Page 39, Additional Rules, paragraph 3: “Also, if Japan attacks any Soviet-controlled territory that is adjacent to any Mongolian territory, all Mongolian territories that are still strict neutral or pro-Allies, or have joined the Allies as a result of a failed Japanese attack, will be placed under the control of the Soviet Union at the end of Japan’s Conduct Combat phase. This will be done in the same manner as though the Soviet Union had moved land units into a friendly neutral territory (see “Friendly Neutrals,†page 10). These territories will have Soviet control markers placed on them, and their standing army units will be placed on the board using Soviet pieces and will be controlled by the Soviet Union player from then on. This will occur regardless of the state of relations between the Soviet Union and Japan at the time of the attack, with one exception: If the Soviet Union has attacked Korea or any Japanese-controlled territory bordering these Mongolian territories while Mongolia was still a strict neutral, Mongolia will remain neutral and not ally itself with the Soviet Union.â€
Page 40, Optional Rule: Research & Development, Step 3. Roll Breakthrough Die: Add to end: “If you roll an advance that you already have, roll again until you get one that you don’t have.â€
Page 40, Breakthrough Chart 1, 3. Paratroopers: “Up to 2 of your infantry units in each territory with an operative friendly air base can be moved to an enemy-controlled territory 3 or fewer spaces away that is being attacked by your land units from adjacent territories and/or by amphibious assault.â€