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)
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)
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)
'Til Death Do Us Part: Part 1 - S2-E1
Other mistake: When Gambit is attempting to kiss Rogue at the wedding, the man standing over Gambit's right shoulder has no face. (00:04:03)
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)
Slave Island - S1-E7
Continuity mistake: After Gambit jumps out of the moving hovercar, it comes to a stop in the middle of the road. When the shot changes, the hovercar is suddenly on the left side of the road (note the yellow lane dividers), and is no longer casting a shadow. (00:12:00)
Slave Island - S1-E7
Continuity mistake: When the lead guard is explaining the inhibitor collars to the new prisoners in the wide shot, you can see Blob at the back of the group, and he is wearing tights, even though he is usually shown wearing a speedo. (00:02:24 - 00:03:41)
Slave Island - S1-E7
Other mistake: When Cyclops, Rogue and Jean Grey exit the War Room to depart for Genosha, at the top of the door frame there is a black spec moving around, possibly indicating that there was some debris or a clump of dust on the animation cells or the camera lens itself during filming. (00:08:15)
Slave Island - S1-E7
Continuity mistake: When Cyclops, Jean Grey, and Rogue enter the War Room to tell Professor X they are leaving for Genosha, the monitor Professor X is watching is level. A couple of shots later, the monitor is now slanted downwards. (00:08:04)
Other mistake: When Gambit, Storm, and Jubilee get into the back of the taxi, you can see the window seat behind the driver is unoccupied, which would suggest the three of them are occupying only two of the backseats. (00:12:51)
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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