In the scene when Jonathon moves in with May, he is carrying a stack of albums in his arms, noticeable in that scene and a later one is The Partridge Family's "Up To Date" LP. May is played by Susan Dey, who played Laurie Partridge in The Partridge Family (1970)
Susan Dey's third and final film where she performed a nude scene.
August has an Elvira poster on his wall. Elvira is played by Cassandra Peterson, who also appears in the film.