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Getting Crap Past The Radar:

"Frenching With Freakazoid" (a segment about learning phrases in French). Not to mention that the phrase being taught was "qui a coupe le fromage?" ... or "who cut the cheese?".

Dexter's brother pointedly calls him a Twink in "Hot Rods From Heck".

There was also a pretty funny exchange between Freakazoid and Cosgrove.
Freakazoid: "Hey Cosgrove, why didn't you ever get married?"
Cosgrove: "I like meat too much."
Freakazoid: "Y'know, you could be married and still eat a lot of meat."
Cosgrove: (beat) "I didn't know that."

Let's just say there's a reason so many adults loved this show.

Never look into your dad's underwear drawer.

The mom CONSTANTLY is allowing random people into Dexter's room (it's even lampshaded), winking when she tells McStew where it is, and assuming the werewolf/'guidance counselor' is playing twister with her son.