- Runs the "Die Wühlmäuse", a place for stand-up and political comedians in Berlin, Germany.
- Has three children: Dieter Hallervorden Jr. (b. 1963) and Nathalie Hallervorden (b. 1966), with Rotraud Schindler; and Johannes Hallervorden (b. 1998), with Elena Blume.
- Purchased a castle in France, the Château de Costaérès, where he moved with his second wife to live.
- After having problems with the communist regime, he fled East Germany in 1958.
- There are reports that he had another daughter, Laura Maria Heid (b. 1990), with Maria Heid; but Hallervorden gives the number of his children as three.
- Although being a respected TV actor and cabaret artist for decades, he is still best known for playing chaotic and annoying slapstick characters on Nonstop Nonsens (1975) and Die Didi-Show (1989).
- Voiced Vlad in the German dub of Hotel Transylvania 2.
- Admitted himself to a hospital in 2022 for 21 days over suicidal ideation.
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