Breakaway Pop Hit: The theme song. It had the longest duration in the Billboard Top 40 of any TV theme, ever. It peaked at #2 a few weeks after the show premiered, but then hung around seemingly forever. It stayed in the top 40 for over two years(!), making it one of the biggest hits of the 1980s.
Dawson Casting: The high school students. So much so that Michael Pare (Tony) is only 3 years younger than Connie Sellecca (Pam). And Faye Grant (Rhonda) is only 2 years younger than Sellecca.
Edited For DVD: In "Operation: Spoilsport" the aliens pressed Ralph forward by continually playing the song "Eve of Destruction." Due to copyright issues the song is replaced in the DVD release.
Real-Life Relative: In "Who's Woo in America," William Katt's real life mother, Barbara Hale, plays Ralph Hinkley's mother Paula.
Robert Culp's sons appear in "Vanity, Says the Preacher."
Screwed by the Network: Series creator and executive producer Stephen J. Cannell had envisioned The Greatest American Hero as a show focusing on down-to-earth, real life problems, the powers would be in the suit, not the guy (though the suit would only work for him) and Ralph would try to solve ordinary-type issues. The ABC executives whom Cannell had pitched the show to, Marcy Carsey and Tom Werner, had actually agreed to go along with this. Unfortunately, however, after the show was picked up, Carsey and Werner left ABC to create their own production company, and the new network executives demanded that Cannell incorporate more fantastic plots, which ultimately alienated viewers.
The final blow came when ABC moved it to Friday Nights. The ratings went down so fast four episodes were left unaired.
Throw It In: The scene of Ralph writing his name on the blackboard with the chalk breaking at the start of the third season's credits was a blooper.
Written andDirected by Cast Member: Robert Culp on "Lilacs, Mr. Maxwell", and "Vanity, Says the Preacher" (the latter was one of four episodes not shown in the network run, although it and the others did get shown in syndication- unlike the pilot for some reason).