Continuity: Just where did the happy face (that appeared when Timmy said he needed to blend in to the 70s) on Timmy's shirt go during the rest of the 70s time?

Factual error: Each time Timmy jumps through time, he goes back 10 years from 2002 (1992, 1982, 1972). However, some of the 80's references, such as Miami Vice, Flashdance & Back To the Future all came out after 1982.

Continuity: At the start of this episode, Crocker breaks a picture of himself as a kid. A shot later when Timmy looks into the window, the broken picture disappears.

Continuity: In an earlier episode, we see that Timmy's dad looks exactly like him as a child, but in this episode, they look completely different.