Although these episodes were aired in 2003, there were made in 2002 according to the credits.
The music playing when Dexter's Dad is sleepwalking is a parody of Santo & Johnny's 1959 instrumental hit, Sleep Walk.
Production code is 405.
The title of the episode is a pun on the word "monstrosity" and Dee Dee.
It is assumed that the chemical effects of the contaminated apples eventually wore off on Dee Dee as the episode doesn't seem to show Dee Dee after Dexter panics and runs to warn his parents.