The original songs "Space Oddity" and "Rocket Man" have been replaced with "It's Not Your Town Anymore" and the theme song "Believe It Or Not", respectively. This was due to the problem of having to pay extra royalties when the show went into syndication (reruns) and later video rentals.
When Ralph is admitted to the hospital for testing as he is protesting his sanity another patient comments on his superhero costume saying "that's a bad outfit, Jim!" in reference to Superman The Movie where the pimp addresses Superman when he is first revealed in the city with a "Say Jim, that's a bad outfit!"
The alien symbol on Ralph's super-suit is virtually identical to Count Lippe's Red Dragon Tong tattoo in the 007 film "Thunderball."
While Kevin is watching television, the cartoon he is watching is the tornado scenes where Batman is talking comes from Super Friends (1973) episode The Planet of Oz (1979) & the scenes where the Commander is talking about the women with glowing eyes with Superman is from Super Friends (1973) episode The Collector/Handicap/The Mind Maidens/Alaska Peril (1977).
Ralph first puts on the suit immediately after stepping out of a telephone booth - this is probably a reference/spoof of Clark Kent changing into Superman while in a telephone booth - something that was probably joked about more often than it actually happen in the comics.