The Secret Origin of Denzel Crocker - S3-E8
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.
Factual error: During the montage of Lizzie and Matt at the charity drive golf tournament, there is one part where Lizzie is standing outside the Men's toilet as Matt uses it. However they are handcuffed together with cuffs that have a chain which is about an inch long, so there is no way Matt could use the toilet with Lizzie standing outside the door. (00:16:40)