Continuity mistake: When Gambit and Wolverine are about to fight each other, Wolverine's claws are extended, and Gambit has a kinetically charged playing card raised in his right hand. When Rogue intervenes, Wolverine's claws are suddenly retracted, his hands are incorrectly colored white, and Gambit's right arm is down at his side, not holding any card. A couple of shots later, Wolverine's claws are once again extended. (00:07:15)
Continuity mistake: When Cable has broken into Warren's lab from the balcony, the doorknobs on the double-door are intact. As the scene progresses, one or both doorknobs will disappear and reappear, and the broken glass on the one door will be intact. Additionally, when the opened door is first shown, there are a couple of broken pieces of glass on the floor next to it. When the shot changes, the pieces of glass are gone. (00:02:35 - 00:04:30)
Factual error: The commercial airplane that Rogue is piggy-backing to Muir Island has no overhead storage bins. Just a shelf running the length of the cabin with luggage stacked on top, which is not something that the FAA or any other national aviation authority would permit. (00:09:20)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When the team arrives at the destroyed mansion at the end of the previous episode, Cyclops' seat is blue, Rogue says "It can't be" while raising her right hand up to her mouth in disbelief, and Wolverine is growling and extending his claws. When the team is shown arriving at the destroyed mansion at the beginning of this episode, Cyclops' seat is now light-red, Rogue says "It can't be" while her arms remain at her sides, and a silent Wolverine is casually putting on his mask and walking towards the exit ramp of the Blackbird. (00:02:23)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When Jubilee is bringing up the message from Xavier, her head is below the top of her chair's headrest. When the shot changes, her head is higher than the headrest. (00:03:41)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When the foreman is handing Colossus the money, it is rolled up and colored white. When the shot changes, it is stacked and colored green. (00:06:11)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When Beast is reading the book in his jail cell, the spine is in the correct place. He then closes the book, and when the shot changes, the spine is now on the opposite side of the book. (00:10:52)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When Wolverine is telling Jubilee not to antagonize Juggernaut, his mouth closes. When the shot changes, his mouth is hanging open. (00:14:42)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When the X-Men begin attacking Juggernaut one by one after he emerges from the rubble, there is some rubble directly in front of him. When Colossus hits him from behind, Juggernaut goes stumbling forward and the rubble that was in front of him has disappeared. (00:17:14)
The Unstoppable Juggernaut - S1-E8
Continuity mistake: When Jean Grey is saying "What if the professor's in there," her hand is colored blue, when it should be flesh-colored. (00:02:36)
Slave Island - S1-E7
Continuity mistake: When Cameron Hodge is telling Gyrich and Trask about Cable, the books on the table move closer to Hodge between shots. (00:13:10)
Slave Island - S1-E7
Continuity mistake: When Gambit is carrying Jubilee over his shoulder, the placement of his hand alternates between being on the small of her back, the back of her thighs, or her butt depending on the shot. (00:13:55)
Slave Island - S1-E7
Continuity mistake: When the Genosha guard tries pulling a gun on Cable, you can see his headgear only extends down to his jawline and chin. When Cable picks him up and throws him, his headgear is now also covering his entire neck. (00:19:00)
Slave Island - S1-E7
Continuity mistake: When Gambit tries to grab the gun, Cable stops him by placing his left foot on top of it. When the shot changes, it is now Cable's right foot that is on the gun. Additionally, yellow lane dividers in the middle of the road disappear when Gambit first reaches for the gun, and then reappear a couple of shots later. (00:12:15)
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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