Trivia: THX-1138 is referenced when, on Hoth, General Rieeken says "Send Rogues Ten and Eleven to station three-eight."
Trivia: In Cloud City, when Chewy finds C-3PO in pieces in what looks like a droid scrap room, you can see what looks like the upper half of IG-88 leaning up against the wall. It is revealed later in books to be the IG-88 unit that went in search of Han, but was intercepted and destroyed by Bobba Fett.
Trivia: When Han Solo fires shots from his blaster at Darth Vader in Cloud City, the weapon zips into Vader's hand. To achieve this effect, director Irvin Kershner threw the gun across the table and the crew photographed a quick take of the gun flying through the air and then put a string on it, put it in the hands of Darth Vader and pulled it out with the camera upside down.
Trivia: A special effects technician added a tennis shoe to the asteroid scene. It can be seen flying from the central-left side of the screen to the lower right. It's right at the beginning of the exterior shot after Han Solo announces that he's going for one of the larger ones, and Leia, C3PO, and Chewbacca voice their objections. (00:39:40)
Trivia: Right before the first transport is away, there is a shot of Leia and others in the control room on Hoth. During this scene a clicking and screeching sound can be heard. It sounds like a clock ticking. This is a recording of a shortwave radio station CHU from Canada, complete with the second ticks.manthabeat
Trivia: Jeremy Bulloch (Boba Fett) is the half-brother of Robert Watts, the associate producer of the movie.
Trivia: Lobot's name is never mentioned in the film, and in the end credits he is simply listed as "Lando's Aide."
Trivia: The name "AT-AT" is never spoken in the film. Instead, the machines are only referred to as "Imperial walkers."
Trivia: When a Rebel soldier is in a turret is destroyed by an Imperial walker during the battle of Hoth, a "Wilhelm scream" can be heard.
Trivia: When Chewbacca throws an Imperial stormtrooper off the ledge before Han is put into carbon freeze, a "Wilhelm scream" can be heard.