Mel's Diner is called "Mel and Ruby's Diner" in the first episode which was the name of the diner in Alice Doesn't Live Here Anymore (1974).
There was an agreement among the writers of this show that if they found themselves in a joke that they couldn't get out of they would just give one of the characters a funny costume or a funny hat.
The actual restaurant that this show is based on is located in Phoenix, Arizona, at 1747 NW Grand Ave. It is currently called Pat's Family Restaurant. It was called Mel's Diner.
The favorite dish at Mel's Diner was chili. Art Carney appeared in an episode, where Mel tries to market his chili commercially.
When Tommy graduated from high school, he went on to Arizona State University where he played for the basketball team.
Earl was Tommy's basketball coach in high school.
Mel's nickname for Vera was "Dinghy".
Mel's nickname for Jolene was "Blondie".
Henry's wife Chloe was talked about for years before she was finally seen. In her only appearance she was played by Ruth Buzzi.
Flo's favorite expression was "Kiss my grits!"
Whenever any of the waitresses disagreed with Mel, he would often tell them to "Stow it".
When Diane Laddleft the series, her absence was explained by having Belle finally sell one of her songs and moving away to become a professional songwriter.
The theme song for the show was sung by Linda Lavin.