For the show's first season, the theme song was performed by the popular family group The Cowsills. For the rest of the show's run, it was performed by The Charles Fox Singers, who were a group of Los Angeles studio musicians that did numerous radio and television commercials.
Every story in the series, and many of the "blackout" vignettes in-between, featured a large, brass bed. This is probably an homage to The Bed (1968) by James Broughton, an experimental poet and filmmaker whose works were an influence on the Beat poets of the 1950s. "The Bed" is an award-inning 20-minute short that was filmed during the 1967 "Summer of Love" in San Francisco, CA. It featured several nude men and women cavorting on a large, brass bed in a garden.
Many of the blackouts were credited to Samuro Mitsubi and Tawisaki Kwi. According to the book "My Happy Days in Hollywood" (2012), the names were pseudonyms for memoir author Garry Marshall and his long-time writing collaborator Jerry Belson.
"Happy Days" (1974) was not a direct spin-off of this show, but an indirect one. Garry Marshall (I) pitched a show to ABC called "New Family in Town". The network turned it down. So Marshall did a vignette on an episode of this show with the three characters. Two years later, American Graffiti (1973) became an unexpected success. The network remembered Marshall's show. It asked him to shoot a pilot with some changes. It wanted a gangster-type character to intimidate Cunningham. Thus, the birth of Fonzie.
Phyllis Davis, who did several low budget exploitation films and co-started in the 1978-1981 TV series Vegas, said she was cast as a repertory player on Love American Style by accident. "I walked into Paramount to have lunch with somebody," recounts Davis. "They had already looked at 200 girls, and I didn't even have an interview. I walked in, and somebody saw me and said, 'Do you have a bikini? Can you do lines?' They gave me a few lines to do in front of the network people and the producers, and I got it that day. It was a fluke and it lasted for years."