- Has two daughters with Morgan Most.
- Appeared at the World of Wheels in Birmingham, Alabama for a Happy Days reunion along with costar Henry Winkler. (February 2009)
- During an interview on Marc Maron's WTF podcast, Most's Happy Days co-star Ron Howard said, on the subject of one infamous episode in which they both acted "Donnie's reading it and he kinda looks down, then says 'what do you think of the script?' and I shrugged and replied 'people like the show, it's hard to argue with being number one' and he looked up and said, 'he's jumping a shark now?'. That was the first time I saw that phrase bracketed, before it was even done, you've got to give props to Donnie Most.".
- Attended Lehigh University in Bethlehem, Pennsylvania.
- Best remembered by the public for his role as Ralph Malph on Happy Days (1974).
- He ACTUALLY sang the song "Devil take me" in the episode "Rock Devil Rock" (Season 6 Episode 4) of the T.V. show CHiP's.
- Interviewed by James M. Tate and Laura Wagner on the Cult Film Freak podcast. He talked equally about the Roger Corman production Crazy Mama as he did his stint on Happy Days.
- It was discussed that he and Anson Williams would have their own spin-off show centering on their Happy Days (1974) characters Ralph and Potsie, but it never materialized.
- Was a member of Sigma Alpha Mu fraternity.
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