Continuity mistake: When the chosen one for the Thieves Guild tries to present their tithe to the External, he is shown walking right up to the tree stump where he was to have placed the tithe. When the shot changes, he is still walking forward, and therefore should've bumped into the stump. He is saying a line of dialogue as he is walking forward, so it can't be considered an action shown from a different angle. (00:06:15)
Continuity mistake: When the chosen one for the Thieves Guild is called forward to present their tithe, the chosen one for the Assassins Guild can still be seen kneeling before the External. In the next shot when the chosen one for the Thieves is shown arriving on the scene, the chosen one for the Assassins is suddenly back to standing among the other members of his guild. In the next shot, the chosen one for the Assassins is back to kneeling before the External. (00:06:00)
Continuity mistake: During Gambit's flashback, the chosen one for the Assassin's Guild is shown to be placing their tithe box on the stump of a tree roughly halfway between the center ring and the outer edge. When the shot changes, the tithe box has suddenly moved to the center of the stump, and the tithe box itself is suddenly wider and shorter and has rotated 90°. (00:05:00)
Continuity mistake: The position of Cyclops' body changes when Jean Grey is cradling his head. At first, he is sitting slightly upright. When the shot changes, he is lying down. (00:04:40)
Continuity mistake: The amount of damage to Cyclops' uniform decreases. When his Danger Room session is first terminated, his uniform is mostly missing around his shoulders and chest. A few shots later, the aforementioned area of his uniform is not as torn up. (00:04:15 - 00:04:50)
Continuity mistake: The size of the hole beneath the trap door in the Thieves Guild's mansion changes. When Wolverine, Rogue and Jean Grey are shown falling down it, it is easily large enough for the three of them to fall down without bumping into each other. When we see the hole in the ceiling after Rogue destroys the wall that was falling on her, the hole is barely large enough for one person to fit through. The hole also moves closer to the back corner of the room, whereas it appeared to be closer to the back-center of the room once they landed.
Continuity mistake: The orientation of Gambit's mini-jet respective to the Blackbird changes. When the Blackbird first lands, the mini-jet is perpendicular to it. When Wolverine, Rogue and Jean Grey go over to inspect the mini-jet, it is suddenly parallel to the Blackbird.
Continuity mistake: Shortly after Wolverine, Rogue and Jean Grey enter the Thieves Guild's mansion, they fall down a trap door. However, the trap door is not there when they first enter the mansion, instead only appearing in the shot where they step on it.
Continuity mistake: When the X-Men regain their mutant powers, Jean Grey is suddenly wearing her uniform instead of the casual outfit she was wearing when she was abducted. In the next shot and for the remainder of the episode, she is back to wearing her casual outfit.
Continuity mistake: The glove on Magneto's right hand disappears after Mr. Sinister blasts him in the back. (00:17:20)
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 Cyclops and Storm are about to be shuffled in to their television program, Jubilee can be seen standing between Wolverine and Storm, despite the fact that she was not among the X-Men that were abducted by Spiral, nor is she seen again for the rest of the episode. (00:10:05)
Continuity mistake: When Rogue is crashing through several levels of the mansion, the last one she crashes through is Storm's greenhouse and you can see through the windows that it is light outside. When she crashes through the ceiling of the mansion a split second later, it is suddenly dark outside. (00:08:15)
Time Fugitives: Part 2 - S2-E8
Continuity mistake: Bishop is shown trying to disperse the crowd at the quarantine site. When Cable appears on the rooftop ready to snipe him, Bishop is shown walking among the crowd. When Cable relents, Bishop is back trying to disperse the crowd. (00:06:15)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Wolverine slashes through the fence, Gambit and Bishop can be seen already running towards the fence while Cyclops, Jean Grey and Beast stand behind. When the shot changes, Gambit is the last person to run through the hole in the fence with Cyclops, Jean Grey and Beast ahead of him. (00:17:40)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: After Storm informs Cyclops that a mob is attacking Bishop, a shot of the rest of the team in the Blackbird shows that Gambit's neck is flesh colored when it is supposed to be black from wearing his headgear (this is corrected when the scene is reprised in the next episode). (00:11:25)
Continuity mistake: Gambit's sleeves turn from black to pink when Bella Donna reveals to him that she double crossed the Thieves Guild. (00:13:25)
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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