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 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
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
Audio problem: When Beast says to Gambit "Though I am always in haste, I am never in a hurry," his mouth is completely closed for most of the line. (00:11:30)
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: 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 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 telling Bishop that he's not letting him out of his sight, the tubes on the back of his right hand are missing, and then are there in the next shot. (00:17:20)
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)
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.
BaconIsMyBFF