The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Revealing mistake: When Xavier is invading Lilandra's mind, the ball of psychic energy on her head shifts left and right as the camera zooms in, likely indicating a composite shot. (00:02:07)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Revealing mistake: When Oracle attacks Jean, a beam of psychic energy emanates from Oracle's body. The beam then remains in place as Oracle moves towards Jean, likely indicating a composite shot. The beam is then back in place when the shot changes. (00:09:55)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Revealing mistake: When the X-Men are being beamed down to the Moon, Rogue's mouth is missing. (00:08:50)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Revealing mistake: In what appears to be an animation error, when Cyclops shoots his optic beam after he and Jean emerge from hiding, his bandolier is absorbed into his uniform. (00:14:25)
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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