Trivia: When filming ROTJ, Lucas didn't want anyone to find out that they were shooting the third Star Wars movie, because pandemonium could break out. So when someone asked the crew what they were filming, they said "Blue Harvest". All of the crew had shirts and hats that said Blue Harvest on them. The fictitious film's tagline was "Horror beyond imagination."
Trivia: When Oola the dancing girl (with those two things growing out of the back of her head) is trying to get away from Jabba, she briefly falls out of the top of her costume. It isn't as visible in the letterbox version, but quite visible in the regular version.
Trivia: The funeral pyre scene wasn't in the original script.
Trivia: There was a rumour that the Lucas crew ran out of space ships in the final battle and threw a sneaker in and used it as a space ship. In the final battle, there is a space ship that looks exactly like the sole of the sneaker.
Trivia: In the new box set of the three original films, they have changed the ending in RotJ to correspond better with the ending in Revenge of the Sith. When Luke sees his father as the Anakin Skywalker spirit, in the final scene at the celebration, it is young Hayden Christensen as Anakin's spirit instead of older Sebastian Shaw, who is the spirit in the original version.
Trivia: This film and the first film (New Hope) were released on the same day, exactly six years apart.
Trivia: The alien language spoken by Lando's co-pilot on the Falcon contains elements of Kenyan, and one line literally translates as, "A thousand herds of elephants are standing on my foot."
Trivia: Ken Ralston, the man who was pretty much in charge of the space battle, put a number of interesting objects in the background. He sometimes used a wad of gum as a far-away shot of a Mon Cal star cruiser, and there is also a sneaker and a yogurt cup floating around.
Trivia: There is a shot of a hangar filled with TIE Fighters, and a brigade of Stormtroopers. One of them has a smiley face on his white helmet.