Beyond Good and Evil: Part 1 - S4-E8
Continuity mistake: When Hairbag knocks Wolverine down, Rogue can be seen lying on the ground next to Storm. A couple of shots later she is shown lying next to Gambit. (00:12:40)
Beyond Good and Evil: Part 1 - S4-E8
Revealing mistake: When Mr. Sinister is mocking Jubilee, take a close look at his neckline as he moves his head. The animators moved his neckline as he moved his head, but his shoulders stay in place, so his head and neck look like they are floating above his shoulders. (00:15:30)
Beyond Good and Evil: Part 1 - S4-E8
Plot hole: Gambit remarks that Shard is his kind of time traveler. However, Shard was inside the mansion and Gambit was outside when he said that, and he had never previously met her, so there was no way he could have known who she was without having even seen her or even that she was a time traveler. (00:17:20)
Beyond Good and Evil: Part 1 - S4-E8
Continuity mistake: Gambit and Beast have instantly appeared behind Wolverine after he asks how the Nasty Boys got inside the mansion. (00:17:55)
Beyond Good and Evil: Part 1 - S4-E8
Plot hole: Beast comments on Mr. Sinister's new-found time travel abilities. However, Beast has no way of knowing that Mr. Sinister is time traveling. He only knows that Mr. Sinister is using portals, which could just as well be for teleportation. (00:18:40)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: Deathbird's wings alternate between being red and purple after Apocalypse betrays her. (00:05:05)
Beyond Good and Evil: Part 2 - S4-E9
Audio problem: When Xavier says "Assemble the X-Men," his mouth movement is slightly out of sync. (00:05:55)
Beyond Good and Evil: Part 2 - S4-E9
Revealing mistake: When Psylocke is scaling the cliffs, her left leg passes through the cliff walls. (00:09:20)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: The length of the chain attached to the collar of Archangel's guard dog varies. When the dog is first shown, the chain is only shown to be around three feet long. When the dog discovers Psylocke, it is able to run several feet towards her and away from the wall where it was chained up. (00:09:35)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: When Psylocke renders Archangel's guard dog unconscious, his chain is still attached to his collar. When Archangel checks on the dog, the chain is missing. (00:09:50)
Beyond Good and Evil: Part 2 - S4-E9
Character mistake: Wolverine refers to Psylocke as having black hair and Archangel refers to her as being raven-haired. She has purple hair. (00:11:55)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: Sabretooth tears off a piece of Psylocke's clothing, yet there is no sign of any part of her clothing being torn afterwards. (00:14:45)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: When Mystique first impersonates Shard in order to fool Psylocke, both Mystique and the real Shard are missing the gun holster that is usually on top of Shard's right shoulder. When Pyslocke and Wolverine both state that they can see through Mystique's deception, the gun holster has suddenly appeared on Mystique's right shoulder. (00:15:50)
Beyond Good and Evil: Part 2 - S4-E9
Audio problem: When Magneto says "I see I must persuade you," his mouth is completely closed. (00:16:30)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: Magneto straps Wolverine to the port side of a boat and then drops the boat on a warehouse. When Gambit is freeing Wolverine, Wolverine is suddenly on the starboard side of the boat. After Gambit frees Wolverine, they are both shown to be on the boat's port side. (00:17:00 - 00:18:00)
Beyond Good and Evil: Part 2 - S4-E9
Continuity mistake: When Storm is clearing the debris of the destroyed warehouse, Sabretooth is nowhere to be seen. A few shots later Sabretooth is visible. Sabretooth was unconscious so he could not have moved into view on his own. (00:17:55)
Beyond Good and Evil: Part 3 - S4-E10
Audio problem: After Bishop says "It's Cable!", Bender says "It will be..." except Bishop is the one mouthing the line. (00:02:55)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Bishop is observing Cable and Tyler from the Axis of Time, his goatee is colored a lighter shade of gray compared to its usual bluish-gray. (00:02:55)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Cable says "You're boring me..." to Xavier, Cable's gun is missing. It reappears in the next shot. (00:08:20)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Cyclops and Cable are arguing about the course of action to take, Cyclops is on the viewer's left and Cable on the right. When Wolverine interrupts them, they have swapped sides. (00:10:25)
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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