The film Richie and Carol take Joanie and Spike to see is not a real film. It was shot especially for this episode, and featured Tony Randall as a werewolf. Randall did this as a favour to Happy Days producer and good friend Garry Marshall.
The Life magazine issue Howard is reading is the issue with the edition date of April 15, 1957. The man in the picture is popular actor and comedian Ernie Kovacs.
The movie that the kids are watching is not a real movie and the stair case they are standing on is the set that they used on Haunted House episode.
This episode features a very rare instance of Henry Winkler as Fonzie actually riding the motorcycle. In one lengthy camera shot, we see Fonzie pull into Arnold's, wave to someone, park his bike, and speak a bunch of lines with Richie.