The Dark Phoenix (3): The Dark Phoenix - S3-E13
Other mistake: When Professor X says "We must do all we can to defeat the Phoenix within her," there is a black spot that moves vertically across the screen as the camera is panning from Cyclops to Wolverine. It's as if there was a small bug on the lens. (00:11:00)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Plot hole: When the X-Men are on the roof of the Hellfire Club confronting the Dark Phoenix, Beast suddenly has some kind of hi-tech backpack-like device, despite being held captive without it in the previous episode, and never shown having one when he entered the club in the episode that preceded that one. (00:03:00)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When the Shi'ar beam down in front of the X-Men, Lilandra and Gladiator have a gap of a few feet between them. When the shot changes, they are suddenly standing closer together. (00:19:14)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Jean collapses after the psychic battle between Xavier and Dark Phoenix, she falls onto the grass. When the shot changes, she is lying on the street. (00:18:33)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Xavier first confronts Dark Phoenix inside Jean's mind, the flaps of Dark Phoenix's waistband are pointed outwards. When the shot changes, they are pointing down. (00:17:15)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Dark Phoenix recovers from Xavier's psychic attack, Storm, Wolverine and Gambit are standing next to her. When the shot changes, Wolverine and Storm have swapped places. Additionally, Gambit's sclera are white when they should be black. (00:16:44)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Dark Phoenix traps the X-Men in an energy field, their orientation within it varies throughout the scene. (00:15:45 - 00:16:27)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Jean is giving Wolverine permission to kill her, Wolverine's bare arms have been colored yellow. (00:15:09)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Cyclops is telling Jean that they all love her and that she loves all of them, Storm has disappeared from the wall of energy that the rest of the X-Men are trapped in. (00:16:10)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Revealing mistake: After Wolverine tackles Jean, the glowing effect of the mnemonic scrambler device on her head briefly moves to a different part of her head. (00:15:08)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Jean runs out of her childhood home to greet who she thinks is her father, there is a short picket fence lining the front yard that wasn't there in the establishing shot of the house. The yard itself also appears to have shrunk. (00:12:58 - 00:14:24)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Jean Grey returns to her childhood home, the panels on the front door as she walks in are shorter than they were in the establishing shot. The door also changes from green to brown. (00:12:58)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When the X-Men are first shown in the dining hall, Gambit and Rogue have empty hands, and Gambit is also wearing gloves. When the shot changes, both are now gripping coffee mugs, and Gambit is barehanded. (00:10:06)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Harry Leland and Sebastian Shaw are watching the Dark Phoenix battle the X-Men from afar, the "tiger stripes" that were on their vests in the two previous episodes are missing. (00:06:52)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Dark Phoenix knocks out Cyclops, his visor flies off his face and lands on the ground several inches from his outstretched left arm. When the shot changes, the visor is suddenly pressed up against his arm. (00:06:28)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Wolverine is walking out of the pond, he can be seen wiping a red substance off his left shoulder that wasn't there in previous shots. (00:03:51)
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)
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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