The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Cyclops says "Defend yourselves," Gambit's gloves are flesh-colored. (00:04:20)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: Rogue's right glove is suddenly back on after the Dark Phoenix knocks her to the ground. (00:06:10)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Gambit says "Why not ask her?", Cyclops' belt is blue when it should be yellow. (00:04:05)
The Dark Phoenix (2): The Inner Circle - S3-E12
Other mistake: When Wolverine lands on Leland with his claws extended, if you look closely you'll see that Wolverine's left hand ends up in Leland's chest area, yet Leland was not impaled by the claws like he should have been. (00:17:15)
The Dark Phoenix (2): The Inner Circle - S3-E12
Audio problem: When Beast jumps off the balcony, the sound when he lands is similar to how it would sound if he was wearing shoes or boots, but he is barefoot. (00:19:00)
The Dark Phoenix (2): The Inner Circle - S3-E12
Audio problem: When Wyngarde says "For new sensations, my love," his mouth is closed for most of the line. (00:12:50)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When the White Queen is probing Cyclops' mind, the neck part of his head gear is flesh-colored. (00:12:10)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops collapses to the floor, his normally yellow visor is now colored blue, and Gambit's normally black pants are now colored light-blue. (00:11:35)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: The pink patches are missing from Gambit's pants when the White Queen blasts him against the bookcase. (00:16:05)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops is trying to reestablish his psychic rapport with Jean, his head gear stops at around his eye level when it normally goes up to his hairline. (00:08:20)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops and Beast are cornering Wyngarde, Beast's entire belt is red, when normally his belt is yellow and the X in the middle has red around it. (00:16:20)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Beast says "We appear to be at the mercy of our hosts," he is noticeably further away from Cyclops than he is from the rest of the episode. The captive X-Men are chained to the floor with not much slack, so he could not have simply moved away from Cyclops on his own. (00:05:50)
The Dark Phoenix (2): The Inner Circle - S3-E12
Revealing mistake: When Cyclops uses his optic beam to blast Leland through several walls, the final wall that Leland goes through already has a hole in it. (00:15:40)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: The "X" mark torn into Cyclops' shirt changes size and position a few times. (00:09:50 - 00:11:10)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Sebastian Shaw is warning the White Queen not to fail the group, the pitchfork-like pin on his jacket disappears between shots. (00:04:10)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: The rubble that Storm is buried under magically removes itself from her. Rogue could not have been the one to unbury her because the rubble falls at the same moment Rogue arrives on screen, and Storm could not have done it herself because she was unconscious. (00:19:20)
Savage Land, Strange Heart (2) - S3-E9
Factual error: The amount of rubble that falls on Storm and buries her should have crushed her to death. (00:18:30 - 00:19:20)
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.
BaconIsMyBFF