Continuity mistake: When Wolverine is slashing at Callisto's staff, it is light purple. When he completely shreds a center portion of it, that portion is blue, and when the shot changes, the rest of the staff is red. Additionally, the center section of the staff has reduced in length after Wolverine shreds it. (00:14:35 - 00:15:03)
Continuity mistake: When Storm and Callisto are about to engage in combat, they are using staves that look like lightsabers, with the hilts at the bottom. When they start striking at each other, both staves now resemble a double-edged lightsaber, with the hilt in the middle. (00:18:25)
Continuity mistake: When Xavier is talking to Jean and Cyclops at the end, the three of them, along with Storm, are all to the left of the bed Gambit is lying on, with Storm being behind Xavier, over his right shoulder, and a piece of machinery behind her. When the shot changes, it is a closeup of Xavier, and neither Storm, nor the machinery are visible over Xavier's shoulder. When Jean and Cyclops leave the room, Xavier is now at the foot of Gambit's bed, several feet away from Storm. (00:20:08 - 00:20:32)
Continuity mistake: When Xavier is saying "We cannot afford to lose again," his fist is raised, and Storm is leaning over him. When the shot changes, his hand is resting on his hoverchair, and she is standing upright and further away from him. (00:20:05)
Continuity mistake: When Xavier is using Cerebro to look for Magneto, his blue and black tie turns yellow when Jubilee says "Professor?" When Storm says "Charles, are you all right?", it is back to being blue and black, and the blue stripes turn yellow before our eyes. (00:11:41)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Beast is leaping through the corridor, the black X with the black rectangular border on a red background on his waistband briefly becomes a red rectangle on a yellow background with no X. (00:02:37)
Continuity mistake: When Apocalypse is saying "Go forth my horsemen," his right arm is raised up. When the shot changes, his right arm is immediately at his side. (00:06:30)
Continuity mistake: When the statue is about to fall on Wolverine, his arms are colored yellow. (00:16:25)
Continuity mistake: The trap door that Apocalypse uses to escape suddenly disappears once Wolverine tries to claw his way through it. (00:19:35)
Continuity mistake: When Warren Worthington is strapped to the table, the arm and leg restraints are gold. After the table has been lowered, the restraints are now silver. (00:02:29 - 00:02:56)
Continuity mistake: When the Lady Gardener kills the rose, it droops down almost to the surface of the table. When the shot changes, it is now only drooping about midway down its vase. (00:03:56)
Continuity mistake: When Rogue, Cyclops, Jean Grey and Xavier are first shown in the bar, the glasses in front of Rogue and Cyclops contain green liquid. When Cyclops is consoling Rogue, the liquid is now blue. When the shot changes, the liquid in the glass in front of Rogue is now green again. (00:03:49 - 00:04:18)
Continuity mistake: When Mystique, disguised as Warren Worthington, first walks into the bar, the walls are purple. When she is saying "You don't have to be mutants," the walls are now red. When the shot changes, they are back to being purple, and a framed picture has appeared over her left shoulder. (00:04:18)
Continuity mistake: When Storm turns on the TV, the news reporter's microphone has a yellow 7 on a black circle. A couple of shots later, the black circle is now also yellow. (00:07:49)
Continuity mistake: When Xavier is briefing the X-Men about Apocalypse, Storm is on Xavier's left, and as the camera pans up and to the left, you can see no-one is around her. When the shot changes, Cyclops and Rogue are suddenly next to Storm. (00:10:21)
Continuity mistake: When Rogue positions the platform that Mystique is shackled to upright, Mystique's feet are close to touching the floor. A couple of shots later, her feet are suddenly several inches higher. (00:14:08)
Other mistake: When Rogue is hovering above Muir Island, she pulls out a book to confirm she's in the right place, and the picture of Muir Island in her book shows it to have three smaller islands on its south side. When she lowers the book to look at the actual island, only the large island shown on the southwest side in the book is there. She's only hovering a few hundred feet above the island, so even though the other two islands were small, they should still be visible. (00:09:48)
Continuity mistake: When Gambit and Wolverine are about to fight each other, Wolverine's claws are extended, and Gambit has a kinetically charged playing card raised in his right hand. When Rogue intervenes, Wolverine's claws are suddenly retracted, his hands are incorrectly colored white, and Gambit's right arm is down at his side, not holding any card. A couple of shots later, Wolverine's claws are once again extended. (00:07:15)
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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