Happy Days is a sitcom that was broadcast on ABC from 1974 until 1984, which focused on life in Milwaukee around the 1950s and 60s.
- The show is spoofed as Snappy Days in the 1983 Hallmark calendar The Muppets Look at TV with Fozzie taking the role of "The Foz" (Fonzie), Scooter in the Richie role, Gonzo (as either Potsie or Ralph Malph), and The Swedish Chef as Arnold.
- At the beginning of the Sesame Street song "Do the Wash", a boy hits a washing machine to get it to start running, much like the Fonz would hit the jukebox at Arnold's to get it to work.
- The official Facebook page for The Muppets posted a photo on August 19, 2015 of a coffee shop barista who got Fozzie's name wrong, confusing it with Fonzie.
- On Twitter, Fozzie was asked if "Fozzie" is a family name. He replied, "I come from a long line of Fozzies! Including my Italian uncle Fozzarelli. Boy, we had some happy days."
- G.W. Bailey played Jack Whitman in the episode "Joanie Busts Out"
- Linda Bove played Allison in the episode "Allison"
- Jack Dodson played Dr. Mickey Malph in "A Sight for Sore Eyes" (1976), "The Last of the Big Time Malphs" (1977), and "Ralph's Family Problem" (1980)
- H.B. Haggerty played Bruno in the episode "Nose for News"
- David Ketchum wrote five episodes and played Lt. Col. Binicky in "R.O.T.C.," Coach Pelino in "A Shot in the Dark," and Donald Hedges in three episodes
- Christopher Knight played Binky Hodges in "Be My Valentine" (1978)
- Cheryl Ladd played Cindy Shea in the second season episode "Wish Upon a Star"
- Garry Marshall created the series, as well as wrote, directed and appeared in multiple episodes
- Penny Marshall played Laverne DeFazio in six episodes and the spin-off Laverne & Shirley
- Michael McKean played Lenny in the episode "Fonzie's Funeral Part 2"
- Pat Morita played Arnold (1975-1976, 1982-1983)
- Donny Most played Ralph Malph (1974-1980)
- Tony Randall played a werewolf in the episode "Not with My Sister, You Don't" (1974)
- Cathy Silvers played Jenny Piccolo (1980-1983)
- Frank Welker provided the voice of Mr. Cool on the animated spin-off Fonz and the Happy Days Gang.
- Paul Williams wrote music and lyrics for the musical based on the show.
- Robin Williams played Mork in the episodes "My Favorite Orkan", "Mork Returns," and the spin-off Mork & Mindy.
- Rita Wilson played Barbara McManus in "Where the Guys Are" (1983) and Roxanne in "A Woman Not Under the Influence" (1982).