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)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: The hole in the floor that Sebastian Shaw falls through is suddenly larger when shown from the underside. (00:16:00)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Sebastian Shaw begins questioning the loyalty of the other Inner Circle members to him, Wolverine is collapsed on the floor next to Shaw and Leland. Moments later when Shaw walks over to the White Queen, Wolverine has disappeared from that spot. (00:13:44)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Wolverine is giving the Dirty Harry speech to the guard, the distance between the two of them varies depending on the shot. (00:05:24)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Gambit throws a kinetically charged playing card at the White Queen, Wolverine is directly behind him, and Beast is behind him and to his right. A couple of shots later when Pierce has lifted Gambit by his collar, Wolverine has disappeared and Beast approaches Gambit from his left. Wolverine then reappears in his original spot after Pierce throws Gambit at Beast. (00:19:09)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When the X-Men first enter the Hellfire Club, Gambit's black pants are incorrectly colored blue. (00:19:03)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Rogue first breaks into the Inner Circle's headquarters, Sebastian Shaw has a pitchfork pin on the lapel of his jacket, which disappears and reappears throughout the rest of the episode. (00:18:40 - 00:20:44)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Rogue is punching Sebastian Shaw, the section of the right side of her outfit that is green is mistakenly colored yellow in the area of her right breast. (00:18:55)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Cyclops is saying there may be innocent bystanders inside the Hellfire Club, Wolverine's face turns yellow. (00:18:01)
Dark Phoenix (1): Dazzled - S3-E11
Revealing mistake: When Dazzler steps off the stage and walks towards Cyclops, she briefly disappears from the screen. (00:16:20)
Dark Phoenix (1): Dazzled - S3-E11
Revealing mistake: When the Dark Phoenix is saying Cyclops might have to protect Dazzler from her, the glowing yellow effect of Jean's eyes are incorrectly placed around her eyebrows. (00:11:55)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When the White Queen is pouring herself a glass of water, she is holding the glass with her left hand and the jug with her right. When the shot changes, you can hear her setting the jug down while simultaneously lifting the glass with her right hand. A couple of shots later after she sets the glass back down on the table, the jug has disappeared. (00:10:16)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: After Storm walks Jean out of the kitchen, the background behind Beast is completely white, when it should be brown because the door is opened, and he is standing in front of it. (00:05:05)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: When Jean first walks into the kitchen, her hand is resting on the door near the top right panel. When the shot changes, her hand is now resting on the lower part of the top left panel. Additionally, the plate on the door in the knob area has disappeared. (00:04:39)
Dark Phoenix (1): Dazzled - S3-E11
Continuity mistake: The street sign that Donald Pierce rips out of the ground to attack Cyclops with wasn't there at the beginning of the scene. (00:02:59 - 00:03:29)
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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