- The "beer" on the sets of Clark's movies was always apple juice and seltzer, with foam added to make it look like beer. Neville Brand was concerned about doing the bar scenes in Clark's Hi-Riders (1978), having struggled with alcoholism himself, and was assured by Clark that there was never any alcohol on his sets.
- Considers one of the proudest moments in his life to be marching in a civil rights parade with Martin Luther King.
- Father of Trevor Clark.
- Played basketball in college.
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