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 knocked into the hot dog stand, he is lying on his stomach with his left arm tucked and his right arm bent at the elbow. When the shot changes, both of his arms are now outstretched. (00:13:37)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Dark Xavier knocks Cyclops into the wall, it leaves a small hole. When Cyclops gets up, the hole is now larger. (00:14:47)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Revealing mistake: When Jean is saying that she feels strange, the edge of an animation cel is visible moving left and right under her pillow. (00:05:27)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier lands his plane on the Muir Island helipad, the nose of the plane is directly to the right of Banshee. When the shot changes, Banshee is now standing a few feet in front of the nose. (00:17:01)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier is looking out at Banshee and Moira from the window to his room, he is facing the window directly. When the shot changes, his left profile is now facing the window. (00:17:31)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Lilandra first appears in Xavier's room, she appears to be around 7 feet tall. She is nowhere near that tall in subsequent shots. (00:18:29)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier is looking at Moira and Banshee from his window, as the camera zooms in on the latter two, you can see they are facing each other, and Moira has her left arm on or near Banshee's hip. When the shot changes, they are standing side by side, with Moira's arms wrapped around Banshee's left arm. (00:17:41)
The Phoenix Saga (1): Sacrifice - S3-E3
Revealing mistake: After the X-Men rescue Dr. Corbeau and retreat back to the shuttle, they come upon a room with crew members passed out on the floor. Keep an eye on Wolverine in the background on the right side of the screen and you will see him literally walk through a door panel. (00:17:28)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Revealing mistake: When Lilandra is saying to Xavier "I have seen your face a thousand times in my mind," the edge of an animation cel is visible around the parietal area of Xavier's head. (00:20:24)
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
Revealing mistake: During the opening battle in outer space, when the green ship uses its tail to tear a hole into the larger ship, you can see the tear slightly shift downward. (00:01:47)
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 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 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 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 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 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 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)
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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