Continuity mistake: When Frasier and Sam are talking in Sam's office, Sam sits down in his chair and leans back, the shot changes and he leans back again. (00:07:15)
Character mistake: When Sam and Diane are embracing and saying goodbye, Diane asks, "Sam?" and Sam replies, "Yeah, Shel." Shelley is the actor's real name. (00:17:00)
Suggested correction: He says "yeah, chum?" It's another word for pal or friend, which is in line with everything else he has been saying.