Trivia: Music composer John Williams has a cameo as a bartender on the planet Kijimi.
Trivia: Anthony Daniels once again portrays C-3PO, making him the only actor to appear in every Star Wars film to this point. He also plays C-3PO for a brief cameo in Rogue One.
Trivia: In the scene where Darth Vader and the Emperor are looking out onto the unfinished first Death Star, keep an eye out for a young Grand Moff Tarkin (played by Peter Cushing in "Star Wars").
Trivia: The first scene in which Obi-Wan and Anakin appear was filmed after principal photography had finished. Ewan McGregor had shaven off his beard, so he had to wear a fake one.
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."