The Silver Gull Club in Breezy Point (NYC) New York was used as the filming location for the fictional El Flamingo Beach Club. The club, which is part of the Gateway National Recreation Area, was heavily damaged by "superstorm" Sandy in 2012.
When Mr. Brody (Richard Crenna) demonstrates a TV remote control to Jeff ('Matt Dillon'), one of the shows he channel-surfs to is The Real McCoys (1957). The scene includes Walter Brennan as Grampa McCoy and... Richard Crenna as Luke McCoy.
After a character leaves, we see a shot of a jet airplane. Originally, the airplane shot was not in the movie. After a Midwestern preview, an audience member asked director Garry Marshall what happened to the character that left. When he heard the question, he had the shot inserted.