Beyond Good and Evil: Part 4 - S4-E11
Other mistake: During the montage of people being erased from time, the exterior shot of the X-Mansion shows part of the mansion destroyed. The mansion is later shown to be destroyed by Graymalkin after the heroes defeat Apocalypse, but at this point in the episode there's no reason for the damage. (00:12:20)
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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