When Mary gets a scoop in the form of secret documents from a Deep Throat-like source, Ted takes all the credit for the story ... until Special Agent Harris from the Justice Department starts asking questions. Mary chooses jail rather than revealing her source, resulting in a comical scene in which she shares a cell with prostitutes. "What did they get you for?" asks one. "Impersonating a Barbie doll, right?"

Raj is unable to speak in front of women outside his own family due to selective mutism--unless he's drunk, in which case he says very inappropriate things.

His uncle got him a job on a loading dock after World War II, and by the 1970s he is a foreman.

Sam has standing orders to have Harry the Hat (known for his signature fedora) thrown out of the bar on sight, but Harry sometimes helps the gang out--partly from sentiment, and partly to protect the Cheers gang from operators even more unscrupulous than himself. As Harry notes, "I don't like the idea of someone else plucking my pigeons."

It wasn't until the end of the fourth season that Greg got his own room--in the attic.

Growing up, Robert thought he had a bed-wetting problem, but it was actually Ray pouring water in his bed while he slept.