Dexter's Laboratory

Mom

Dad

Dexter

Monkey

Valhallen

Dee Dee

Dee Dee

At the end of episode "Blackfoot and Slim", Dexter is sporting an ear tag. The identification on the tag is "BG 1138", an obvious reference to George Lucas' THX 1138 (1971).

An episode made early on in the show's run was banned from television before it even aired. Entitled "Rude Removal," its main plot centered around Dexter and Dee Dee accidentally making evil clones of themselves. The clones constantly swear and create havoc; the title card even features Dexter mooning the audience while Dee Dee gives them the middle finger. A movement was started in 2012 to air the episode. Adult Swim, a section of Cartoon Network, managed to gain the tape and now has the episode on their website to watch freely.

In the episode "Sdrawkcab", Dexter speaks backwards a few times in the show. Here are some things he says backwards: In the scene which Dexter keeps falling up and down, he says "That was close" in reverse. After Mom yells at Dexter about how she thought he was taking out the trash, he says "I did!" backwards.

In the episode where Dexter is learning piano, the professor says they'll start on C, but they clearly start on F.

Mandark: In your dreams, you freaky little gnome

Mandark: Say no more, Dexter, oh ye of little mind. I'll save the day and take all the glory!

Mandark: All hail Mandark, the genius! All hail Mandark, the genius! Sing a song of Mandark, the greatest genius this world has ever known!