Continuity mistake: Gambit is missing his gloves when Jean Grey stops him, Wolverine and Cyclops to tell them what Professor X told her about the alien ship. (00:15:20)
Continuity mistake: Gambit's black cowl is suddenly blue when Jean Grey is explaining that the alien spacecraft is a prison ship. (00:15:25)
Continuity mistake: When Gambit is saying "How are we gonna beat this thing when we can't even get close to it?", Jean Grey is on the viewer's left of the group and Cyclops is on her left. When the shot changes, Jean and Cyclops have swapped places. (00:16:31)
Continuity mistake: Beast is present when Gambit destroys the Spirit Drinker. When Professor X arrives moments later, Beast is shown to be approaching the scene with him and then notes that the Spirit Drinker seems to be missing. (00:18:45 - 00:19:25)
Continuity mistake: Wolverine's 5 o'clock shadow disappears and reappears throughout the episode.
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is telling the X-Men about their mission to take control of the space shuttle, some shots show Cyclops and Jean Grey seated immediately to the left of Jubilee and Wolverine, and other shots show a gap between them. (00:03:24 - 00:04:37)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Gambit is walking past Xavier in the War Room, the collar of Xavier's shirt is suddenly much wider than previously shown. (00:03:39)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Gambit announces his presence in the War Room, there is a rectangular panel on the wall to his left that is the same color as the rest of the wall. When the shot changes, the panel is now a darker gray. (00:03:41)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is talking with Cyclops in his bedroom and turns toward the window, the back of his hover chair is pointed towards the open area immediately on Cyclops' right. When the shot changes, the back of the hoverchair is directly facing Cyclops. (00:05:09)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Cyclops asks Storm to give the team cover, so they can infiltrate the space center, she is standing directly behind him, close enough to have her hand on his shoulder. When the shot changes, she is standing all by her lonesome. (00:06:11)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Wolverine is breaking open the door to the space center, he leaves a long tear around the handle. When the shot changes, the tear has disappeared, and then returns in the next shot. (00:07:05)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When the X-Men barge into the locker room, as Gambit is running towards the camera, you can see his gloves are entirely fingerless, whereas when the team first entered space center grounds, only his thumb, index finger and pinky were fingerless. (00:08:01)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Cyclops knocks out all the astronauts, they are in a large locker room area. Moments later when the astronauts are shown lying unconscious, the room is now a narrow corridor. (00:08:03)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Cyclops is saying "They'll be safe in the isolation chamber " he and Jean Grey are standing near the lockers on the left side of the screen, four floor tiles away from the door. When the shot changes, the two of them have suddenly moved to the right, in line with the door, and only two floor tiles away from it. The floor tiles themselves are also now drastically smaller. (00:08:32)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is watching the shuttle launch, he has some sort of wheel on the right side of his hoverchair. Moments later when he regroups with Storm and Jubilee, the wheel is now missing. (00:09:17 - 00:10:07)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Beast is saying "Doctor, the solar probe, its shielding should be able to protect us," his neck alternates being different shades of blue. (00:19:05)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Cyclops and Wolverine bring Jean back above the water surface, her wet hair is pointing straight down. When the shot changes, her hair is suddenly wavy and parted over her forehead. (00:05:00)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier and Cyclops begin arguing in the hallway, the door and doorway to Jean's hospital room are visible over and behind Xavier's right shoulder, and a chart is a few feet to the right of the door. A few shots later when Cyclops is telling Xavier that he failed to warn everyone, the chart is still visible, but now the door is missing, with the wall now appearing to be longer. (00:06:40)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is getting ready to attack Dark Xavier, the ticket booth behind him is unoccupied. When Dark Xavier deflects Gambit's kinetically charged playing card to the ticket booth counter, a man is now inside the booth. The bottom center window also goes from being closed to being open. (00:12:16)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is saying "Wolverine, what's happening," the sclera of his eyes are white, when they should be black. (00:12:16)
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.
BaconIsMyBFF