Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is telling Rogue that he'll park her car, the pink stripes that are normally on his pants are missing. (00:02:40)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit announces his arrival, he is standing just in front of the doorway. When he puts his hands up after Bishop draws his gun on him, there is now a wall behind him. (00:03:07)
Days of Future Past: Part 2 - S1-E12
Factual error: The U.S. flag has 13 stripes. When Bishop is telling the X-Men how Gambit's betrayal will affect the future, the flag shown flying outside the Capitol building is missing two stripes. In the next shot showing the flag draped over the coffin, it has at least 17 stripes. (00:04:25)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Xavier is speculating if he is the one Gambit is supposed to assassinate, he is at Jubilee's 3 o'clock. When the shot changes, he is now at her 2 o'clock. (00:06:31)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Storm is saying "It is the only way to be certain," the pointed end of her right earing is briefly square-shaped. (00:07:53)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Cyclops is telling Gambit that they can't allow him to leave, he is standing behind Xavier's right shoulder. When the shot changes, Cyclops has disappeared. (00:07:53)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Bishop is shooting an energy blast at Gambit, he has three playing cards and five poker chips in front of him, while Wolverine also has three cards. When Wolverine is telling them both to sit down, Bishop now has four cards and eight chips, and Wolverine has four cards as well. Additionally, the deck has moved closer to the center of the table, and the arrangement of Wolverine's chips and the arrangement of Gambit's cards and chips have changed. (00:08:35)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Blob is looking out the hotel window, the window panes have been opened at a 90° angle. When the shot changes, the opened panes are no longer visible. When the shot changes again, the windows are slid open, which would make it impossible for the panes to have been positioned at a 90° angle in the first place. (00:09:07)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Mystique is warning the Brotherhood not to fail, the TV is off. When the shot changes, it is suddenly on, and the antenna is suddenly smaller. (00:09:16)
Days of Future Past: Part 2 - S1-E12
Revealing mistake: When Gambit draws a card from his sleeve to use as a trap, the gloved part of his hand that is below the pocket is translucent. (00:09:28)
Days of Future Past: Part 2 - S1-E12
Plot hole: When Gambit charges an object with kinetic energy, it makes a high-pitched sound. When he places a charged card on the arcade game to use as a trap, Wolverine should have heard it, as he possesses a superhuman sense of hearing, especially since Gambit muted the TV. (00:09:28)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit hands Bishop the deck of cards to cut, Bishop places them at a diagonal angle in front of him. When the shot changes, the deck is now pointing straight. (00:09:36)
Days of Future Past: Part 2 - S1-E12
Character mistake: After Gambit escapes from Wolverine and Bishop, Bishop says to Wolverine "No wonder you sent me back to change the future, because everything that happens is your fault." Wolverine didn't send Bishop back to change the future. He insisted on going back himself, but Bishop forced Wolverine out of the mission and inserted himself into the role because he felt Wolverine was too old to succeed. (00:10:03)
Days of Future Past: Part 2 - S1-E12
Deliberate mistake: When the crowd is protesting outside the Capitol, the same man with black hair and a brown outfit has been drawn numerous times in the shot. (00:10:23)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Avalanche and Pyro are attacking the chambers, Avalanche destroys a bookshelf that wasn't there at the beginning of the scene. (00:10:42 - 00:11:17)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is jumping onto the tree branch, the first shot shows that he is jumping towards the right side of the tree. When the shot changes to him landing on the branch, it is suddenly on the left side of the tree. (00:12:00)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Blob first confronts the X-Men, there is a light post behind him. When Rogue has her hand stuck in his chest, the light post has disappeared. (00:12:17)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: After Blob knocks Cyclops to the ground, Jean helps him up, and the two of them are standing a step away from Blob. The shot changes to Blob pointing and laughing for roughly a second, and when the shot changes again, Cyclops and Jean have disappeared, with not enough time to have moved offscreen. (00:12:20)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Rogue punches the Blob, her arm is shown to be sinking into the middle of his chest. When the shot changes, her arm is suddenly in his stomach. (00:12:25)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Wolverine is running towards Blob from behind, he is in his direct path. When the shot changes to Wolverine jumping onto him, he emerges from the right side of the screen instead of from directly behind him. (00:13:29)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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