Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Wolverine slashes at Donald Pierce's arm, the sleeve of Pierce's jacket is torn around the elbow. When the shot changes, nearly the entire sleeve is torn off. (00:19:27)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Gambit and Cyclops are first shown in the club, Cyclops is sitting at the front of the table. When the shot changes, he is now at the back of the table next to Gambit. (00:02:15)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: After Moira says "I've done all I know to do for her," Banshee can be seen standing between and behind Xavier and Moira. When the shot changes, he is suddenly standing directly behind Moira. (00:01:58)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: When Gambit and Storm were knocked unconscious in battle, they were lying next to each other. When Xavier revives them in order to stop Dark Phoenix, they are several feet away from each other. (00:10:54 - 00:15:15)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: When Earthquake knocks out Gambit and Storm, he and Hussar are offscreen to the viewer's left. When the shot changes, Hussar is standing directly behind where Gambit and Storm's heads are pointing. (00:10:54)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: When the X-Men are standing on the platform waiting to be transported to the Moon, Gambit is standing directly behind Jean and Cyclops, with Storm on his right. When the shot changes, Gambit has disappeared. (00:08:34)
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
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 (2): The Inner Circle - S3-E12
Continuity mistake: When Beast jumps down to attack Sebastian Shaw, his waistband changes from red to yellow. (00:17:07)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Sebastian Shaw is pulling the secret book on the bookcase to open the passageway, he pulls from the center column on a row of all yellow books, roughly 4 books from the edge. When the shot changes, he is pulling the right-most book on the column to the left of the center column, and the books on the shelf are a variety of colors. (00:18:15)
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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