Continuity mistake: When Carly is telling Graydon Creed to leave her alone, her head is tilted towards her right shoulder. When the shot changes, she is facing straight. (00:15:57)
Continuity mistake: When Wolverine interrupts the two men playing poker, you can see there are only cards and chips on the table. When the shot changes, a mug has appeared next to the white man's left elbow. (00:16:28)
Continuity mistake: When Wolverine cuts the doorknob off the door, you can see some of the door on the right side is still intact. When the shot changes, this part of the door is now completely missing. (00:16:55)
Continuity mistake: When Wolverine is asking Graydon Creed if he looks familiar to him, his cuspids are very long and sharp. Later when Wolverine is sneering at Creed during his breakdown, you can see his cuspids are now flat and not as long. (00:17:29 - 00:19:36)
Continuity mistake: When Beast is kissing Carly on the forehead, his left eyebrow goes from being black to blue to black again. (00:20:20)
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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