Atleast four The Powerpuff Girls (1998) cartoons have Dexter of Dexter's Laboratory (1996). All are cameo scenes. First, Dexter is the sleeping boy in The Powerpuff Girls: Insect Inside/Powerpuff Bluff (1998). Second, Dexter's character figure is seen during the montage sequence as the Professor tries finding the correct chemical frequency solution in The Powerpuff Girls: Criss Cross Crisis (2000). Third, Dexter is just the figure of a doll in The Powerpuff Girls: Hot Air Buffoon/Ploys R' Us (2000). Fourth, Dexter can be seen in the background and standing on the sidewalk in The Powerpuff Girls: Forced Kin (2001).
Girls... What is it that makes a man, a man?
The ending narration ("And so, once more, the day is saved, thanks to... the Powerpuff Girls!") is different in a few episodes, depending on what happened in that episode.
Episode segment "Birthday Bash" of The Powerpuff Girls: Birthday Bash/Too Pooped to Puff (1999) was edited in the UK because there was a scene where the Mayor says, "I got the little bugger" when he catches a target. In the UK, bugger is considered a profane and obscene word, so the word was overdubbed with the the Mayor saying "I got it!", from an earlier scene.