Trivia: Frank dresses up as Frankenstein in this episode for an in-joke alluding to the role he played in 1974's Young Frankenstein.
Dick's Big Giant Headache (1) - S4-E23
Trivia: When the Solomons meet the Big Giant Head at the airport and ask how his flight was, he says that it was horrible because when he looked out the airplane window, he saw something on the wing of the plane. Dick responds that the same thing happened to him. William Shatner appeared in the 1960's Twilight Zone episode "Nightmare at 20,000 Feet" in which a gremlin tried to destroy the wing of a plane. John Lithgow appeared in "Twilight Zone: The Movie" playing the same character in the same situation.
Helga's Makeover/The Old Building - S1-E4
Trivia: Helga walks by the "Law Office of Garcia, James A."; Tricia Garcia is the storyboard artist for this episode.
Steve Gets the Sniffles - S2-E1
Trivia: During a mailtime segment, there's a rare Blue's Clues poster visible.
Trivia: After modeling in underwear in an issue of Maxim magazine to promote "Drive Me Crazy", Archie Comics threatened to sue Melissa Joan Hart for breach of contract and to fire her from the show, as her contract stated she could never portray Sabrina naked, and the name "Sabrina" was printed on the cover of the magazine. Hart was able to make the situation go away simply by writing an apology letter.