- Critical Research Failure: A billboard in 1998 depicts Amy Rose with her design from Sonic Adventure, which wasn't released in North America until the following year.
- Fanon Discontinuity: The episode depicts the lives of The Simpsons throughout the 90s, completely ignoring that the events of episodes which aired during the show's earlier seasons that took place in the 90s, and completely rewriting canon as a result. This may have been upgraded to Canon Discontinuity in later seasons, since they continue to depict Homer and Marge as having gotten together in the mid-1970s.
- They Changed It, Now It Sucks!: The general response to Homer and Marge dating in the 90's rather than in the 70's.
YMMV / The Simpsons S19 E11 "That '90s Show"