Trivia: In the show, there's a running gag of Charlie being obsessed with the waitress and her constantly rejecting him. In real life Charlie (Charlie Day) and the waitress (Mary Elizabeth Ellis) are married. They married in 2006, although they were dating before the show started.
Trivia: More recent seasons have fewer scenes outside the front of the bar - the cast have said the area's been gentrified over the years, so it's now a bit too nice looking around there to match the low-rent feel of the setting.