Trading Places/Trivia

Actor Allusion: When Louis is arrested, one of the cops individually inspects each of his possessions, states what it is aloud, and then places it in a cardboard box. The cop is played by Frank Oz, who did the exact opposite (taking items out of the box and returning them to the protagonist) in The Blues Brothers.
Career Resurrection: The film completely resurrected the 75-year-old Don Ameche's film career, which had essentially ended in 1949. He had only appeared in five films in the interim with the last one being in 1970. He won an Oscar for Best Supporting Actor for his next film Cocoon and worked steadily until a month before his death in 1993.
Development Gag: Former Nixon aide and Watergate felon G. Gordon Liddy was approached to play the part of Clarence Beeks. In the movie Beeks is shown reading Liddy's autobiography Will on the train.
Hey, It's That Guy!: Several, but most notably -- "Hey, is that US Senator Al Franken as the pot-smoking baggage handler?"
- Al's supervisor is Johnny, the weird guy ("Rapunzel, Rapunzel!") from Airplane!.
- Marcus Brody is Coleman.
- And that's Principal Vernon as Clarence Beeks.
- Isn't that Jim Belushi wandering around the train in a gorilla suit? And later in his underwear.
- Who knew that Zachary Lamb used to be a bartender before he started flying helicopters for the LAPD?
Hey, It's That Voice!: The cop who busts Louis for PCP possession is Bert and Grover and Yoda and Fozzie Bear and Miss Piggy.
History Marches On: Modern commodities markets have "breakers" that prevent prices from changing as rapidly as depicted in the film, precisely to avoid the sort of mess the Dukes tried to cause and profit from, as well as the kind of mess they ended up getting themselves into. These limits were added a few years after the film was made. The law that changed this is even informally known as the "Eddie Murphy Rule", though it may have had more to do with the real-life events that inspired end of the film (see Ripped from the Headlines in the main section).
Mean Character, Nice Actor: Don Ameche was nothing but a gentleman in Real Life, and apologized constantly for his use of the N-word, and for his Precision F-Strike.
- Likewise Paul Gleason, who played Clarence Beeks. He could make Eddie Murphy and Dan Akroyd laugh.
Playing Against Type: Before this Jamie Lee Curtis mostly played the Final Girl in slasher movies and therefore the good wholesome character. She deliberately took the role to break away from this type casting.
Technology Marches On:
- The plan at the end would only work in the days before computer trading.
- Louis boasts that his watch is waterproof to three atmospheres. Nowadays watches can be waterproofed to 50 atm.
Throw It In: When Randolph tosses Mortimer's money clip back, Don Ameche bounces it back and forth a couple of times before catching it.
Unintentional Period Piece: The shots of the World Trade Center (including a ground-perspective shot of how tall the towers were) cast a bit of a shadow on an otherwise fresh, entertaining comedy.
What Could Have Been: The movie was originally written as a Richard Pryor / Gene Wilder vehicle, but when Pryor dropped out and Eddie Murphy signed on, he asked that Gene Wilder be replaced, because he didn't want people thinking he was trying to be another Pryor.