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, 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 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 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 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: 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 Professor X, Cyclops and Jean Grey enter the room where Senator Kelly was abducted, Cyclops goes over to inspect the hole in the wall and Professor X states that his watch has stopped working. Cyclops, still on the other side of the room, asks why that's important. When Professor X drops his watch and it clings to his hover-chair to demonstrate that it's been magnetized, Cyclops is suddenly behind Professor X. (00:20:30)
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: The final scene from the previous episode is reprised in the beginning of this episode, yet some of the dialogue is different or omitted altogether. In Part 1, when Storm says "We all have dark sides to our souls," Wolverine responds by telling her to speak for herself and states he's more suspicious of Bishop than anybody. Also, when Rogue walks in and asks who Bishop is, before anyone can tell her, Gambit announces his arrival. When Bishop accuses Gambit of being the traitor, Gambit tells him he thinks there's been a mistake. In this episode, Wolverine never states that he is suspicious of Bishop, Professor X tells Rogue who Bishop is before Gambit walks in, and when Bishop accuses Gambit of being the traitor, he fires his gun at him before Gambit can even say anything.
Continuity mistake: When Magneto is battling the Sentinels after they have rescued Senator Kelly, bandages suddenly appear on Magneto's right arm, something that's not supposed to be there until after the X-Men have rescued Magneto and patched him up. (00:04:25)
Continuity mistake: When the X-Men are flying to where Magneto is, the sclera of Gambit's eyes are colored white, when they should be black. (00:04:37)
Continuity mistake: When Gyrich is in the car trying to get Trask on the phone, he is shown to be sitting in the backseat on the passenger side (note the windows immediately to his right and behind him). When his driver crashes the car into a tree, Gyrich is shown exiting the car from the front passenger seat. (00:08:00)
Continuity mistake: When Gyrich's gun slides over next to Cyclops' feet after Wolverine tackles him, you can see Cyclops, Rogue, and Storm are standing at the entrance of the Lincoln Memorial. When the shot changes, the three are no longer near the entrance. (00:09:07)
Continuity mistake: When Trask's voice is first heard coming from Gyrich's cell phone, the phone is in the top left corner of the floor tile. When the shot changes, the phone is now in the center of four smaller tiles. (00:09:12)
Continuity mistake: When Gambit is asking Xavier why the X-Men must all die to save Senator Kelly, the top of Wolverine's mask is incorrectly colored blue. A few shots later, this portion of the mask is correctly colored yellow, but then the portion of his mask by his right cheek is also yellow, when it should be black. (00:09:48)
Continuity mistake: When Wolverine is telling Jubilee that she isn't going on the mission, the parts of his mask next to his cheeks are yellow, when they should be black. (00:10:41)
Continuity mistake: When Jubilee is saying how much being a member of the X-Men means to her, one shot shows Gambit looking despondent, and the lines on his collar armor are missing. (00:10:53)
Continuity mistake: The exploding playing card that Gambit uses to destroy a few Sentinels and draw the rest above ground is cleverly shown to be the ace of spades (also known as the death card in some folklore), but the card he is shown charging up before the Sentinels see it is the 2 of diamonds. (00:12:10)
Continuity mistake: Jubilee destroys a Sentinel by tricking it into colliding with a train car full of tar and then using her powers to blast the car and cause tar to spill all over the Sentinel. After Jubilee is rescued by Rogue from the Sentinel that grabbed her from behind, the Sentinel that Jubilee destroyed, as well as the train car, have disappeared. (00:13:20)
Continuity mistake: When Master Mold is telling Trask that mutants are humans, Trask's right hand is raised near his face. When the shot changes, his hand is suddenly lowered at about waist-level. (00:15:11)
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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