Continuity mistake: When Rogue and Ms. Marvel crash-land into the ground, Rogue pushes Ms. Marvel to the side, with Ms. Marvel's hair being near the edges of the hole in the ground. When the shot changes, the edges of the hole are still in shot, but Ms. Marvel's hair is nowhere to be seen. (00:15:31)
Continuity mistake: When Pyro is unmasking Ms. Marvel, the wristband on Blob's right arm is missing. (00:15:37)
Continuity mistake: When Rogue is visiting the comatose Carol Danvers in the hospital, Danvers' hair is parted down the middle and her bedsheets go all the way up to her neck. A couple of shots later, she has a lock of hair going down the middle of her forehead, and her sheets only go up to around her armpits. (00:20:17)
Continuity mistake: When Beast and Dr. Bohlson enter Carly's room, there is no breast pocket on Dr. Bohlson's labcoat. A couple of shots later, his labcoat now has a breast pocket with two tongue depressors in it. (00:02:25)
Continuity mistake: The metal tubes on Wolverine's gloves appear and disappear when he is talking to Jean Grey. (00:04:19 - 00:05:07)
Continuity mistake: When Wolverine is infiltrating the Friends of Humanity's headquarters, and later when he is talking to Graydon Creed in their auditorium, some shots show him wearing a gold wristband on his left wrist, and other times he is not wearing one. (00:06:20 - 00:14:30)
Continuity mistake: The Friends of Humanity members have patches on the backs of their shirts/vests/overalls that say FOH, but when the two members are checking on Wolverine in the alley, their patches read HOH. (00:07:00)
Continuity mistake: The word-plate on the eye clinic director's office door is silver when first shown. A few moments later, it is the same color as the door, and the lettering isn't as bold. (00:07:45)
Continuity mistake: When Beast first enters Carly's room to tell her he won't be at her operation, she is not wearing any headphones. When the shot changes, she is suddenly wearing some. (00:08:15)
Continuity mistake: When Beast is looking through the photo album, it reads "Family Photos" on the front cover. When he tosses it to the floor, the "Family Photos" writing has now moved to the back cover. (00:09:35)
Continuity mistake: When Beast throws the book at the mirror, his reflection remains stationary while he himself is walking towards the mirror. (00:09:50)
Continuity mistake: Just before the mirror shatters, Beast's reflection shows him burying his face in his left hand. When the shot changes, it is his right hand. (00:09:55)
Continuity mistake: When Beast first enters Carly's room at the end of her procedure, there is no window on the door. Later when Carly's father enters, the door now has a window on it. (00:11:05 - 00:12:05)
Continuity mistake: When Dr. Bohlson is starting to remove the bandages around Carly's eyes, he is not wearing a stethoscope. After Beast interrupts the procedure and walks up to Carly, Bohlson is suddenly wearing a stethoscope. (00:11:05)
Continuity mistake: When Dr. Bohlson is cutting through the bandages around Carly's eyes, there is an audible tear, but when he stops cutting and steps away, the bandages are completely intact. (00:11:10)
Continuity mistake: When Dr. Bohlson follows Beast out of Carly's room, he closes the door behind him. A couple of shots later, the door is open. The door is then closed again when Bohlson is reentering the room. (00:12:30)
Continuity mistake: When Cyclops says to Beast "We're ready to help," his left hand comes into view, and you can see it is bare. Moments later, he is now wearing a glove on that hand. (00:14:55)
Continuity mistake: When Graydon Creed is interrogating Carly, their positions in the room are different depending on the shot. When first shown, she is tied to a chair, with a bare wall a few feet to her left. When Wolverine enters the room, he enters through a door that is now on the wall on Carly's left that was previously bare. When Wolverine tells Creed to let her go, they are suddenly right next to a wall on Carly's right. Then when Creed is pointing the gun at Wolverine and for the remainder of the scene, Carly is suddenly facing the door Wolverine came through. (00:15:35 - 00:17:50)
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)
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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