Every scene with Lamar had him smoking a pipe; however, it was always the same pipe. Dedicated pipe smokers have numerous pipes and rotate their use as they need about a week to recover from smoking, therefore they never smoke the same pipe day after day.

Dr. Matsutani in Econ 1 displays a second-semester textbook instead of a first-semester textbook.

Near the end when the class is over the teacher (Julia Roberts) and her colleague step into the restaurant where Tom Hanks works, as he introduce himself the colleague says "the one who smells good?" revealing his teacher told her there's been more, a detail she asked him not to disclose.

The bar code on Larry's college photo ID spells his surname incorrectly as Crown instead of Crowne.

It is far more likely Julia Roberts' character would go by Professor Tainot than Mrs./Ms. Tainot to her students. She cannot go by Dr., since she earned only a Masters degree, but her title as a college instructor would still be Professor.