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: 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 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)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Bishop is telling Wolverine that Sentinels only want to kill rebellious mutants, his neck alternates between being the same color as his skin and the same light blue color as his uniform. (00:04:51)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Bishop is holding out his ID card for the Sentinel to scan, the card is gray with a red stripe on top, a lighter gray stripe underneath it, and a white mark underneath that. When the shot changes, the entire card is the same shade of gray. Additionally, in some of the shots of Bishop holding out the card, the he is wearing the temporal band on his arm that he doesn't receive until a few minutes later in the episode. (00:04:55)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Wolverine and Bishop are standing in front of the time portal when Forge activates it, they are standing in such a way that Wolverine's left arm is in front of Bishop's right arm. When the shot changes, their arms are now side by side. (00:07:12)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Bishop peeks out of the alley after arriving in the past, there is a wrecked car on the right side of the screen, with a fire hydrant near its front bumper, on an uninterrupted sidewalk. When the shot changes to Bishop stepping out of the alley, the fire hydrant is now by the car's rear bumper, and there is a driveway leading into the alley. Additionally, the building that is behind Bishop changes color from red to green. (00:10:09)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Beast is telling Gambit that he must see his incarceration through to the end in his own way, he places his left hand on his chest. When the shot changes, his arm is suddenly down at his side. (00:11:19)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Beast is thanking Rogue and Gambit for the book, his fingernails are trimmed. When he is telling Gambit that he needs to see through his incarceration in his own way, his fingernails are suddenly long. (00:10:58)
Days of Future Past: Part 1 - S1-E11
Revealing mistake: When Bishop is stepping out of the alley, you can see that he actually appears out of thin air and proceeds to step out from the outer wall of the building on the right. (00:10:15)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Beast is straightening the bent bars to his prison cell, the middle of his waistband has changed color from red to yellow. (00:11:37)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Bishop is watching footage of the X-Men on his armband, in the shot of the team running towards the camera, Gambit's collar armor is colored pink, when it should be blue. When the band displays a still image of the team, Wolverine's bare right arm is incorrectly colored yellow. (00:12:06)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Wolverine first places the time band on his arm, it is on the upper half of his forearm, just above where his glove ends. When he is pulling the gun out of the cabinet, the band has now moved closer to his hand. (00:08:00)
Continuity mistake: When Storm turns on the TV, much of the Eiffel Tower is in the background. A couple of shots later, the reporter is standing in front of a building that would obscure much of the Eiffel Tower, and is also suddenly standing next to a news van. (00:07:47)
Continuity mistake: When the cameraman drops his camera, it lands on the ground and rests on a rock so that the lens is at a slanted angle. When the shot changes to the camera's point of view, it shows Apocalypse right side up, when he should be slanted to correspond with the camera. (00:10:14)
Continuity mistake: When Cable grabs Warren through a shelf on his bookcase, he knocks several books onto the floor. When Warren pushes the bookcase over, there is an overhead shot of the floor surrounding the bookcase for several feet in each direction and there are no books visible on the floor. (00:02:50)
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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