While filming a scene where Harry (Peter O'Toole) rides his bicycle on a downtown street, an extra stepped out from a building too early and caused him to have a minor crash.
In a 2015 interview with John Aanensen, composer Sylvester Levay said that he was hired to replace another composer's existing score. Since time and money were short, the score was composed entirely electronically.
At the beach house, Harry tells Boris that Lucy was a former Miss New Jersey. Karen Kopins, who plays Lucy, was a former Miss Connecticut.
Several "flashback" scenes were filmed at the Santa Cruz Beach Boardwalk, but they were cut from the final print.