Billy Dee Williams, who later played Lando Calrissian in "The Empire Strikes Back" and "Return of the Jedi," auditioned for the role of Han Solo. See more...
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Continuity: Towards the end of the film, the Death Star rounds the planet towards the moon in order to destroy it. The movie continually reverts back to the Death Star where a commander informs us of the time until the Death Star is in range of the rebel base. It will then show the panel with the Death Star's co-ordinates and how long until contact. However, it does not count down in minutes, it counts down in seconds. E.g the commander will say "40 minutes till contact" yet the screen will start at 40 seconds and count down, 39, 38, 37. Regardless of whether or not they use the same time system as us, the time would have run out far too quickly.
Continuity: In the scene after Carrie Fisher inputs the Death Star plans into R2-D2 the droid moves towards C3-PO along a corridor. As you watch you can follow R2's movements until the camera cuts away. If the shot were to continue it seems clear that R2 would have banged into a piece of set protruding from the side of the corridor.
Continuity: When a stormtrooper stands guard by the door of the control room, the door is low enough for someone to hit their head on. But when C-3PO wants to take R2-D2 "down to maintenance", there is plenty of clearance between the trooper's head and the bottom of the door. This has nothing to do with camera angles, as Threepio is the same height as the trooper, and walks out of the room with no problem.
Continuity: During the final battle at the Death Star, nearly every time Darth Vader is shown in his ship's cockpit, the actor's (presumably David Prowse's) eyes are visible through his helmet's lenses. It seems that in this movie, but not the two following it, red lenses were used on the helmet, and the red light of his cockpit causes a transparent effect, showing an unscarred actor instead of the deformed Anakin.