Days of Future Past: Part 2 - S1-E12
Factual error: When Gambit is inside his mini-jet after escaping from Bishop and Wolverine, his radar screen says "Washington D.C." but the graphic above it is Washington state.
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
Continuity mistake: When Mystique starts walking away from Rogue, her footsteps are audible, and she takes about four steps. When the shot changes to a closeup of Rogue asking why Mystique tried to turn her into one of Apocalypse's slaves, if you listen carefully, you can hear Mystique take about ten more steps. When the shot changes again, Mystique is suddenly only a couple steps away from Rogue. (00:18:58)
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 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 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
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
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 Rogue and Mystique land next to the reflecting pool by the Washington Monument, the water is still. A couple of shots later, the water is oscillating. (00:18:36)
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
Continuity mistake: When Senator Kelly is untying the bound woman, she is in a different part of the room than she was when Kelly and Mystique first entered (note her position relative to the bookshelves). (00:15:50 - 00:16:27)
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 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, 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
Continuity mistake: When Wolverine has his hands draped around Blob's eyes and neck, the parts of his mask that are next to his cheeks are colored yellow, when they should be black. (00:13:33)
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)
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 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
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)
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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