Continuity mistake: When Gambit answers the phone, he brings it to his right ear with his right hand. When the shot changes, he is holding it to his left ear with his left hand, and he is also facing the opposite direction. (00:02:53)
Continuity mistake: When Gambit is asking why Cyclops wants his Danger Room session to be tougher, there is a microphone a few inches from his mouth. When the shot changes, the microphone has disappeared. (00:02:44)
Continuity mistake: When the Danger Room monster has ensnared Cyclops, the slime coming off its tentacles is green. When the shot changes, the slime is orange. (00:02:18)
Continuity mistake: When Xavier and Magneto are trying to escape from Vertigo, Xavier cuts the ropes of the bridge they are on, leading him and Magneto to swing into the cliff wall and hop down safely to a ledge below. When they look back up at Vertigo, she is at roughly their 10 o'clock, with the other side of the bridge by her feet. Considering that they just dropped down onto the ledge and have only moved a couple steps to their left, the other side of the bridge should still be directly across from them. (00:15:45)
Continuity mistake: When Omega Red is at the podium and gloating about the rebirth of the Soviet Union, the hammer and sickle emblem on the podium is the same color as the rest of the podium. When he destroys the podium, the hammer and sickle is now red on a blue background. (00:15:08)
Continuity mistake: When Omega Red ties up the parliament member with his coils, there is a space of about two feet between the man and Omega Red's wrist. When Omega Red begins siphoning the man's life force and reeling him closer, there is suddenly more distance between the two. (00:09:24)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Morph is looking at the mansion through a pair of binoculars, the binoculars have two lenses. When the mansion is shown from the binoculars' point of view, there is only one lens. (00:13:43)
Continuity mistake: In the flashback of Shadow King terrorizing a young Storm, in one shot she is shown sitting on the palm of his left hand. When the shot changes, she is now on the palm of his right hand. (00:15:18)
Continuity mistake: When Rogue is saying that Xavier could barely handle the Shadow King, Storm is looking over her right shoulder. When the shot changes, she is looking forward. (00:09:47)
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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