Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When the Four Horsemen are retreating back into the pyramid, the opening is shown to be illuminated. When they are shown entering the opening, it is in darkness. (00:17:15)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: At the end when Mystique says "What was that?" her normally-red eyebrows are colored white. (00:19:40)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Wolverine sniffs out one of Apocalypse's booby traps, the portion of his mask that runs down either side of his cheeks that is normally colored black is now colored yellow. (00:16:30)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Beast opens up the entrance to Apocalypse's pyramid, the "X" symbol on his belt that is normally black on red is now red on yellow. (00:15:15)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Beast is asking Xavier what he saw in Sabretooth's mind, Beast is missing the "X" symbol from the center of his belt. (00:11:10)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Cable is ordering Xavier to probe Sabretooth's mind, Cable is carrying his gun in his right hand. When the shot changes, Cable is no longer holding his gun. (00:10:55)
Beyond Good and Evil: Part 3 - S4-E10
Continuity mistake: When Cable is ordering Xavier to probe Sabretooth's mind, Sabretooth's normally-brown headgear is flesh-colored. (00:10:50)
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)
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: The position of Cable's gun when it is holstered on his back varies throughout the episode. Sometimes it is slanted at a 45° angle with the butt going over his right shoulder, sometimes it is sticking straight up with the butt going over his left shoulder, etc.
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)
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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