Continuity mistake: Near the end of the film, when the Millennium Falcon is trying to get away from Vader, there's the scene in which Vader asks the admiral if he disabled the hyperdrive on the Falcon. This scene is backwards, as you can tell by the insignia on the admiral's chest. Normally it should be on the left side of the chest, but in this scene, it is on the right side of his chest.
Continuity mistake: When Lando is talking to Han and Leia in the cell in Cloud City, Leia says, "And we're the bait." As the shot ends, her hand is on the nape of Han's neck, but in the next shot, her hand is on his back.
Continuity mistake: When Leia is briefing the Rebel pilots, some of the men behind her change position between shots.
Audio problem: After Han goes to the command centre during the battle on Hoth, Leia says to a controller, "Send all troops in sector twelve to the south slope to protect the fighters," but the words don't match her lips.
Revealing mistake: After Chewbacca pulls R2-D2 away from the power socket, he runs away, and you can see white rubber soles under his feet.
Continuity mistake: Widescreen version: When Leia, Han, Chewbacca and C-3PO are first walking through Cloud City, as Han says to Lando, "You sound like a businessman", Chewbacca is walking behind Leia. In the next shot, he is ahead of her, and then seems to walk to the side to wait for her. In the following shot, he is behind her again.
Continuity mistake: When Vader and Luke are duelling on the catwalk over the chasm, Luke lies on his back after he falls. In the first shot, he is lying in front of the steps leading to the round part of the platform, but when he rolls sideways a few seconds later, he is lying on that part of the platform.
Continuity mistake: After Luke's hand gets cut off, as he's going down the tunnel you can see his hand.
Revealing mistake: After the headless AT-AT begins to fall over, watch its back leg on the right side of the screen. You can see a broomstick being pushed up from under the set. It raises that foot up in order to ensure that the AT-AT falls to the left side of the screen.
Revealing mistake: After C-3PO gets shot, as Chewbacca walks over to the door, his right foot crushes one of the steps on a small set of stairs.
Continuity mistake: When Vader cuts through three poles at the end of the lightsabre duel, there are different poles in the shot where he cuts through them and the next shot where they fall.
Continuity mistake: After Han is frozen in carbonite, the outline of his shirt indicates that he is wearing a different shirt from when he was frozen. It isn't the shirt he's wearing after being unfrozen in "Return of the Jedi", it looks more like the shirt he was wearing in "Star Wars".
Other mistake: In the original version, in the first wideshot of the Super Star Destroyer, on the right side of the screen, the light of a Star Destroyer (but nothing else of it) can be seen just flying through space for two seconds before it disappears. This mistake is fixed in the Special Edition.
Continuity mistake: After Leia, Han and Chewbacca walk down the stairs in the carbon-freezing chamber, as the shot ends, Han is turning towards a stormtrooper behind him. In the next shot, he is turned in a different direction, and Leia's head is facing another way. The position and existence of some of the people around them changes between the two shots as well.
Audio problem: When Luke is about to leave Dagobah, he says, "But Han and Leia will die if I don't," but the words don't match the movement of his lips.
Continuity mistake: When Lando releases Leia and Chewbacca, as Leia says, "What do you think you're doing?" her body is turned in a different direction from the previous shot, and she's holding the blasters differently.
Continuity mistake: When Vader cuts through the three poles at the end of the lightsabre duel, Luke is crouching down next to them. In the next shot, he is standing upright.
Continuity mistake: During the escape from Hoth, C-3PO is far behind Han and Leia as they are running to the Millennium Falcon after the cave-in blocks their path. When they reach the door, he is much closer to them.