Plot hole: This episode showed that Beast was an original member of the X-Men and also depicted the original X-Men battling Magneto. However, when Magneto attempted to break Beast out of jail in the season 1 episode "Enter Magneto", Beast said to him "I don't believe we've met. Magneto I presume."
Plot hole: When Jubilee and Iceman are tied up, Jubilee has metal "mittens" over her hands that prevent her from using her powers to escape, but Iceman notes that they failed to learn about his powers and uses his ice powers to break free from his ropes. Iceman was in his ice form when X-Factor attacked him and Jubilee, and they also know that he previously attacked their compound, so they should have known that he had those abilities. (00:13:40)
Continuity mistake: The tray of food Beast brings for Iceman has suddenly disappeared when he asks him about Lorna. (00:09:20)
Continuity mistake: In the opening scene, the security guard's badge disappears between shots. (00:01:10)
Continuity mistake: When Professor X is apologizing to Iceman, there is a red contour line on the side of his hoverchair that wasn't there before. (00:18:05)
Continuity mistake: Iceman's ice form alternates between being transparent and solid throughout the episode.
Continuity mistake: Strong Guy completely disappears from the screen after the water tower falls on him. (00:17:25)
Continuity mistake: Havok goes from being completely buried under boxes to be only buried up to his waist. (00:16:55)
Continuity mistake: When Lorna discovers Havok half-buried under the boxes, the shirt he was previously seen wearing under his jacket is missing. (00:17:55)
Continuity mistake: Throughout the episode, the graphic on Jubilee's shirt alternates between being an X in a circle and a circle with a horizontal line going through the center.
Continuity mistake: Jubilee's earrings disappear when she insists on helping Iceman inside the compound. (00:11:55)
Continuity mistake: When Iceman steps onto the containment field platform, Professor X moves over right next to him, hovering over the platform himself. When Professor X activates the containment field to trap Iceman in place, Professor X is suddenly away from the platform. (00:07:45)
Character mistake: When Beast discovers that Iceman has escaped from the containment device, he takes several steps in the room before he even realizes that Iceman is gone. The device was not obscured by anything, so Beast should have realized as soon as he entered the room that Iceman was gone. (00:11:30)
Continuity mistake: When Iceman is saying to Professor X "You can't tell me what to feel...", Professor X's tie is solid blue when it is supposed to be blue and black striped. His suit is also missing the breast pocket and handkerchief. (00:07:35)
Continuity mistake: When Beast is hanging upside down from the light, his belt is blue when it should be yellow. (00:05:00)
Other mistake: When Cyclops blasts Iceman with his optic beam, the image of Wolverine encased in ice remains on-screen, when it looks as if the shot was supposed to completely change to Iceman getting knocked back by the blast. (00:05:35)
Character mistake: When the two security guards are arguing over whether heat or humidity is worse, one guard says "It's midnight, and it's still 97°." However, moments before that the same security guard checked the temperature on his computer and it indicated it was 85°.
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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