Before shooting one of the final scenes needed in the film, Mark Hamill was involved in a car accident in which he injured his nose and left cheekbone. As a result of this, a double was used for the landspeeder pickup shots. See more...
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Continuity: When Luke returns after dinner, he comes back and finds C-3PO hiding. When Luke finds out that R2-D2 is gone, he runs out of the room and outside. But you see the stairs he runs up to get outside. When you see Luke arrive and takes out the micro-binoculars C-3PO is right behind him. There is no way that C-3PO is that quick to keep up with a younger Luke. What did he do run?
Audio problem: [Special Edition only] In the scene where Luke and Leia swings across the missing bridge, a number of the shots fired by Leia are "bangs" instead of the laser "zap" sound. The bang is probably from the prop gun used (it shot blanks) and was never dubbed over (until the 2004 DVD release).
Continuity: When the rebel leaders are studying the tactical illustration of the Death Star, it shows a large, round indentation positioned at the Death Stars equator. The Death Star actually has a smaller, round indentation in its northern hemisphere. Can't be due to intentional differences between the plans and the finished thing, otherwise the rebels would have no way of knowing that the vulnerability was still there either.