- He was considered for the part of Michal Exner in Poklad byzantského kupce (1967), eventually played by Jirí Vala.
- His name is pronounced "Yahn Kah-tcher".
- He was a Czech actor and film director, and he appeared in more than sixty films from 1960 onwards.
- Kacer was a parliamentary representative in the Federal Assembly from 1990 to 1992.
- He was an actor and a director in The Drama Club and later Theatre on the Balustrade.
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