Audio problem: Cable, Erik the Red and Captain America all have the exact same voice.
Continuity mistake: Archangel's alumni status (or lack thereof) with the X-Men varies throughout the series. Later episodes showed him to be an original member of the team just like in the comics, yet when he first appeared in Season 1, none of the other original members in the show (Cyclops, Jean Grey and Professor X) seem to know who he is. The time traveling mutant Shard also states in Season 4 that he is destined to eventually join the X-Men.
Deliberate mistake: There's at least two episodes (Season 1's "Captive Hearts" and Season 4's "Sanctuary, Part 1") in which a character shows video footage of the X-Men and various supporting characters in action, but the footage is merely clips from previous episodes.
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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