Savage Land, Strange Heart (1) - S3-E8
Revealing mistake: After Wolverine says "I'll take a smell-see," Jubilee jump-cuts towards him before she begins walking. (00:13:52)
Savage Land, Strange Heart (1) - S3-E8
Revealing mistake: When Storm is saying "I am free," the flashing green effect on her eyes moves down to her neck when she tilts her head back. (00:12:22)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Lykos is walking by the museum, the lettering on the banner above the doors is spread out almost the entire width. When the shot changes, the lettering is now more compacted. (00:05:56)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Karl Lykos is climbing into the aircraft, the color of the lumbar section of the seat changes to a darker shade of yellow between shots. (00:04:06)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Storm is explaining her behavior to Rogue, the communication devices from her chest are missing, owing to her ripping them off a few scenes earlier. Moments later when Rogue is draping a blanket over Storm, the communication devices are suddenly back in place. (00:20:12)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Wolverine is calling out to Rogue and Storm, his claws are retracted into his arms. When the shot changes, his claws are extended. His hands also go from being cupped around his mouth to being instantly down at his sides. (00:19:15)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Beast is holding up Storm's arm and saying "Crisis contained," his white fingernails have been colored the same blue as his fur. (00:09:25)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Wolverine places his hand on Storm's head, her eyes are open. When the shot changes, her eyes are closed. When the shot changes again, her eyes are open again. (00:08:25)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Rogue is walking towards Beast after he has sedated Storm, there is a hut directly to her right. When the shot changes, the hut has disappeared. (00:07:41)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Beast is quoting Shakespeare, his map is brown with yellow edges. When the shot changes, the entire map is brown. (00:06:26)
Savage Land, Strange Heart (1) - S3-E8
Character mistake: The sign advertising the New York City Comic Con has "NUFF SAIDI" written on the bottom. The second "I" in "said" is supposed to be an exclamation point. (00:04:39)
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)
Savage Land, Strange Heart (1) - S3-E8
Revealing mistake: When Zaladane is helping Sauron escape, she uses her staff to reveal a hidden stairway in the floor. As Sauron descends the steps, the opening fades back into resembling the floor to suggest it is being hidden again, but Sauron fades away as well. It should be that Sauron walks out of view, and then the opening fades back into the floor. (00:02:56)
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)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: When Sauron is saying "Cowards, fools, come back," his mouth isn't moving. (00:02:02)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When Gladiator is telling D'Ken who Corsair's prisoner is, the section of the wall directly behind the tip of the throne is green. When the shot changes, it is now the same bluish-gray color as the rest. (00:15:43)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Audio problem: When Lilandra is saying "No, for the sake of the universe, no," her mouth movement is not in sync for some of the dialogue. (00:18:23)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Erik the Red is asking Lilandra why she won't answer him, there is a lamp in the background on the left. When the shot changes, a decorative stand has appeared next to the lamp. (00:12:00)
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 (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)
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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