Continuity mistake: When Magneto, Kazar, and Xavier are ambushed in the citadel, they are standing near the doorway leading to the stairs. When the shot changes, they are suddenly several yards into the room. (00:14:55)
Continuity mistake: When Sauron is hypnotizing Xavier, the space between Xavier and Magneto is greater than previously shown. (00:16:11 - 00:18:29)
Continuity mistake: When Beast is theorizing that Xavier was coerced into contacting them, Gambit is sitting upright. When the shot changes, Gambit is now slouched in his chair (note his head is higher than the headrest in the first shot). (00:20:05)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is shown returning to his original timeline, he is wearing the temporal band on his right arm. However, when he was sent back to his timeline at the end of the episode Days of Future Past: Part 2, he was not wearing the band because Rogue tore it off his arm and crushed it, which is what caused him to be sent back in the first place. (00:05:08)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Forge is first shown standing in front of the tube containing Wolverine's skeleton, the skeleton is incorrectly shown to be around 7 feet tall (Wolverine is only 5'3"). A couple of shots later, the skeleton is now shown to be more accurately sized. (00:05:19)
Continuity mistake: When Pyro is unmasking Ms. Marvel, the wristband on Blob's right arm is missing. (00:15:37)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is trying to disperse the mob, the circular patches on his shoulders are red with yellow borders, and a thin circle design is within the red circle itself. Moments later when he throws Wolverine off himself, the red circles are now blank, and their borders are black instead of yellow. (00:11:00 - 00:11:50)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: Throughout the episode, Bishop's goatee alternates between fully covering his chin and having a small spot of exposed skin beneath the soul patch. Sometimes there is even the outline drawn of the exposed skin beneath the soul patch, but it is colored the same as the goatee. (00:05:10 - 00:20:05)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Graydon Creed is first shown giving his testimony, in an overhead shot, we see the front row of the benches in front of him are filled with civilians. When the shot changes, the X-Men are now occupying the row on Creed's right. (00:14:34)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is saying that the virus was genetically engineered, the chin area of Bishop's black goatee is the same color as his skin. (00:13:01)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the camera is panning across the X-Men as they are listening to Graydon Creed's testimony, Wolverine's arms are folded, and you can see the top portion of the blue glove on his left hand is the same yellow color as his outfit. (00:14:27)
Mojovision - S2-E11
Other mistake: When Jean is trying to dodge Spiral's teleporting blast, she ends up tripping on a power cord running across the floor. An electronics store wouldn't have a power cord running across its floor for this very reason. They would be begging for a lawsuit if they did. Her foot is also closer to the wall in the first shot than in the second shot. (00:07:30)
Mojovision - S2-E11
Character mistake: The label on the bottle that Major Domo gives Mojo reads "Mojos aniacid," when it should read "Mojo's antacid." (00:03:20)
Mojovision - S2-E11
Continuity mistake: When Wolverine and Jean Grey are being shuffled in to their television program, Wolverine's face is yellow. (00:15:35)
Mojovision - S2-E11
Continuity mistake: When Jean is asking Mojo to leave Cyclops alone, some of the television screens that Cyclops just destroyed with his optic blasts are now intact. (00:06:28)
Mojovision - S2-E11
Revealing mistake: When the Gladiator robot shoots an optic blast at Wolverine, you can see the hole in the chest area of Wolverine's uniform is already there before the blast hits him. (00:16:24)
Mojovision - S2-E11
Continuity mistake: When Mojo is talking to Cyclops through the television screen, the screen is roughly the size of a car's back-seat window. When the shot changes, the screen is drastically larger. (00:05:02)
Mojovision - S2-E11
Factual error: When the title screen for Longshot's television show is reflected in Mojo's right eye, the reflection is not reversed like it should be. (00:02:00)
Mojovision - S2-E11
Continuity mistake: When Mojo first starts talking to Cyclops through the television screen, Jean is standing next to Cyclops on his right. She then disappears and reappears for the next several shots, and when Mojo is telling Cyclops that he's offering the X-Men a lifetime television contract, she walks up to Cyclops. (00:04:59 - 00:05:48)
Mojovision - S2-E11
Continuity mistake: The cube that Mojo has the X-Men captive inside is transparent on all sides, except for when Cyclops is saying "The X-Men don't fight without a reason." In this shot and the following one, the wall behind them, as well as the ceiling, are now paneled. (00:09:36)
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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