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 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 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
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
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 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: When Mystique, disguised as Gambit, is removing the blindfold from the woman, the lines on Gambit's collar armor change length and then disappear. The lines defining Gambit's pectoral and abdominal muscles disappear as well. (00:15:55)
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 Mystique is leading Senator Kelly into the room to kill him, a window has appeared on the door after they enter. (00:15:40)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Mystique first enters the room where she plans to murder Senator Kelly, there are two bookshelves on the left, with the one closest to the camera being shorter than the one next to it. When Gambit and Mystique are getting ready to square off, the bookshelves are in the background, and they have swapped places. (00:15:52 - 00:16:15)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Bishop comes into the room where Gambit and Mystique are fighting, Gambit is between Mystique and the door. When Bishop shoots Gambit, Gambit is suddenly near the window (note the green curtain). (00:16:31)
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 Mystique is walking away from Rogue, they are standing on the pavement next to the Washington Monument reflecting pool. When the shot changes, they are standing on grass. (00:19:10)
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 1 - S1-E11
Continuity mistake: Bishop's goatee is the same color as his flesh when he is first shown sitting down in the War Room. (00:14:55)
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 Xavier's watch magnetically clings to his hoverchair, the body of the watch is pointing at 1 o'clock. In the next shot, it is pointing at 12 o'clock, the minute hand has advanced roughly 4 minutes, and the watch has also moved down the chair and to the right a few inches (note the contour lines on the chair as the visual cue). (00:20:39)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Wolverine is saying "Thanks kid," to Bishop, his face briefly turns yellow. (00:06:21)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Jean Grey is inspecting Bishop's gear, she isn't wearing any lipstick. A couple of shots later, she is suddenly wearing lipstick. (00:15:05)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Wolverine is asking Bishop if he knows him from somewhere, his pupils have been drawn as small black circles inside a blue circle that are the same color as his eyes. Within the same shot, his small pupils suddenly become larger by filling in the rest of the blue circle, and then just as quickly go back to being small. (00:04:27)
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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