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Reiner did direct the comedy-drama film titled "Where's Poppa?" released in 1970. The plot revolves around a young man's attempt to find his biological father while encountering comedic misadventures along the way. Starring George Segal, Ruth Gordon, Trish Van Devere, Ron Leibman, and Robert De Niro in his debut role, the film showcases Reiner's early directorial talent and humor-driven storytelling style.