The first play he produced was Blue Denim, by James Leo Herlihy and William Noble, and the first play he directed was the comedy Absence of a Cello in 1964.
The year after the film's release deWilde would address more adult themes in Blue Denim.
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Berlinger appeared in both the Broadway stage and Hollywood movie productions of Blue Denim (winning a Theatre World Award for the stage version), and also Happy Time, Anniversary Waltz (later adapted as the movie Happy Anniversary), and Come Blow Your Horn in 1961.