Beatrice Colen reprises her role of Marsha Simms for this episode's flashback, but her name and character do not appear in the credits. It is her final appearance in the entire series.
Tom Bosley wore a hat in the flashback scene, due to his graying hair.
Joanie could not appear in the 'flashback' scenes, as Erin Moran had aged much since the show's start and there was no young actress who looked enough like her to play it.
For the first two seasons, the inside of the Cunningham home was vastly different, with the front door being to the viewers' left and the stairs turning to the right. It wasn't until the third season that the set changed to the more familiar view. However, in the flashback which clearly predates season 1 since Richie had not met Fonzie yet, the Cunningham home is the same was it was in season 3 and thereafter.
Chachi joins a gang called the "Lords." The same year of Happy Days' debut in 1974, Henry Winkler starred in a movie called The Lords of Flatbush (1974) where he is also in a gang called the "Lords."