George Lucas has stated that the two main characters, Roger and Penny Henderson, are actually the parents of Richard Dreyfuss' character Curt Henderson from American Graffiti (1973); making this film a bit of a semi-prequel.
While prominently billed, George Burns is only in the film for a little over a minute. He also only had three scripted lines. The rest of his dialogue came from a previous performance in "An Evening With George Burns".
Rosemary Clooney's final feature film appearance.
Willard Huyck and Gloria Katz wrote the original screenplay in 1974 based on George Lucas' film treatment. Their script contained references to old-time radio shows and popular stars from the 1930s. However, when the film was produced decades later, Universal Pictures insisted the screenplay be rewritten to remove any references which Baby Boomer cinema-goers might not recognize. Lucas later regretted acquiescing to Universal's demands.