Trivia: Fred MacMurray wears his real-life wedding ring throughout the movie. His character in the movie is single.
Trivia: Hulagu Khan (1217-1265) was the grandson of Genghis Khan, and the brother of Kublai Khan, perhaps the two most famous Mongol lords. He conquered Baghdad in 1255.
Trivia: The character of Jonathan is referred to several times in the film as a thug who "looks like Boris Karloff." This was an in-joke referring to the fact that Karloff played the role of Jonathan in the original Broadway production of Arsenic and Old Lace..
Trivia: When Elmer finds himself in the year 2000, he picks up a newspaper with a headline saying "Smellevision replaces Television!" Underneath this there is a caption saying "Carl Stalling sez, "It will never work!" Carl Stalling was the music composer and arranger for the Looney Tunes and Merrie Melodies shorts produced by Warner Brothers.
Trivia: When Porky and Daffy are parking their car, there is a building beside them advertising a doctor's office "Dr Brown - Leap In, Limp Out" - a reference to the Warner Brothers sound editor Treg Brown.
Trivia: When we see Elmer pointing his gun at Bugs in order to make him do his second curtain scene, you can see behind Bugs a crate saying "5 Clampett Trained Seals" - a reference to the Warner Brothers director, Robert Clampett.
Trivia: Gaslight was teenage Angela Lansbury's first film and first Academy Award nomination and Ingrid Bergman's first Academy Award win.
Trivia: Even though Daffy Duck is the main character, he doesn't actually appear until the cartoon is over halfway finished.