The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: Professor X's usual hoverchair was destroyed by the Dark Phoenix in the previous episode, so the Shi'ar gave him a new one to use on their starship. However, when Professor X is lamenting over the X-Men's imminent defeat against the Shi'ar Imperial Guard, he is back in his original hoverchair. Towards the end of the episode, he is back in the Shi'ar hoverchair. (00:04:10 - 00:13:15)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: When Gambit says to Wolverine "Gambit will be ready," his pants are light-blue colored. A couple of shots later, they are back to being their usual black. (00:05:30)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Continuity mistake: After Storm rescues Gambit from falling to his death and they fly outside, when the shot changes they have literally appeared out of thin air. (00:10:30)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Cyclops says "Defend yourselves," Gambit's gloves are flesh-colored. (00:04:20)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: Rogue's right glove is suddenly back on after the Dark Phoenix knocks her to the ground. (00:06:10)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Continuity mistake: When Gambit says "Why not ask her?", Cyclops' belt is blue when it should be yellow. (00:04:05)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When the White Queen is probing Cyclops' mind, the neck part of his head gear is flesh-colored. (00:12:10)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops collapses to the floor, his normally yellow visor is now colored blue, and Gambit's normally black pants are now colored light-blue. (00:11:35)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: The pink patches are missing from Gambit's pants when the White Queen blasts him against the bookcase. (00:16:05)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops is trying to reestablish his psychic rapport with Jean, his head gear stops at around his eye level when it normally goes up to his hairline. (00:08:20)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Cyclops and Beast are cornering Wyngarde, Beast's entire belt is red, when normally his belt is yellow and the X in the middle has red around it. (00:16:20)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Beast says "We appear to be at the mercy of our hosts," he is noticeably further away from Cyclops than he is from the rest of the episode. The captive X-Men are chained to the floor with not much slack, so he could not have simply moved away from Cyclops on his own. (00:05:50)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: The "X" mark torn into Cyclops' shirt changes size and position a few times. (00:09:50 - 00:11:10)
The Dark Phoenix (2): The Inner Circle - S3-E12
Continuity mistake: When Sebastian Shaw is warning the White Queen not to fail the group, the pitchfork-like pin on his jacket disappears between shots. (00:04:10)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: The rubble that Storm is buried under magically removes itself from her. Rogue could not have been the one to unbury her because the rubble falls at the same moment Rogue arrives on screen, and Storm could not have done it herself because she was unconscious. (00:19:20)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: When Storm breaks off communication with Beast, the animation suggests that she is removing the communicators from her chest, but they remain in place. A couple of shots later, they are completely gone. They then reappear and disappear throughout the rest of the episode. Note: this mistake may only apply to the version of the episode that appears on the DVD. In the version of the episode that appears on Disney+, Storm does indeed rip the communicators off her chest. (00:16:20)
Savage Land, Strange Heart (2) - S3-E9
Continuity mistake: The edges of the chasm that Jubilee hangs from go from being uneven to straight-lined. (00:13:40)
Answer: It appears a number of factors led to its demise. It was originally intended to air for 65 episodes, but its popularity extended that. However, there were continual production quality problems, issues regarding whether the content was suitable enough for children, as well as financial considerations that finally led to it being ended.
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