Deliberate mistake: Season 2, episode 6 "Identity Crisis": When Bizarro starts decaying into the parody form of Superman, his costume goes with it; the blue fades, and even the 'S' insignia changes. Strange that superhero garments change right alongside their wearers when they suffer from an unstable genetic effect. Were the clothes cloned right onto his body, instead of sewn?
Superman: The Animated Series (1996)
Starring: Tim Daly, Dana Delany, David Kaufman
Character mistake: In the third instance where Superman manages to get rid of Mxyzptlk, he uses an article full of typos which spell the latter's name backwards as KLTPZYXM. Among the incorrect words is the word "citrimes", in which Superman has included an I and a T, so the correct word in context with the rest of the text should read "crimes" and thus the errors would spell KL-I-TPZYXM. Since there are no vowels in MXYZPTLK, however, what is the additional I doing here - and why didn't Mxyzptlk bother to mark it as a mistake, either?
Monkey Fun - S2-E13
Other mistake: Season 2 episode 13 "Monkey Fun": Just before the enlarged Titano appears at the zoo, there is a family watching normal-sized monkeys in a cage. The family father (farthest on the right) has a drawing disorder with his eyes: their pupils look up and down, respectively, giving him a rather goofy expression.
Trivia: When Kyle is knocked into the airfield by Siniestro, he crashes into a Sabre jet. As he recovers, we read the pilot's name as Col. Hal Jordan. This is the name of the second, Silver Age Green Lantern.
Mxyzptlk: Your three months are up! And this time you're not gonna cheat me of my fun.
Superman: Oh, it's you again, Mr. Kltpzyxm.
Mxyzptlk: NOT Kltpzyxm! Mxyzptlk! Now,  the first thing I'm gonna do - ah, nuts! [Disappears.].
Superman: A game has rules. Your stunts are just random idiocy.
Mxyzptlk: Okay, I'll give you a rule. You make me say, spell or otherwise reveal my name backwards, and I'll split until our dimensions come into alignment again in about, oh, three months, say give or take.
Superman: I can't even say your name forward. How am I supposed to say it backward?
Mxyzptlk: No, dope! You don't have to say it backward. You have to get ME to say it.
Superman: Say what?
Mxyzptlk: Kltpzyxm! Gosh, you're thick! Now, for the last time - ah, nuts. [Disappears.].
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