Trivia: The Imperial officer's uniforms were patterned after the uniforms of Nazi officers to add to their "villainous" image.
Trivia: Harrison Ford wasn't an original candidate to play Han Solo. He was originally brought in simply to feed lines to the other auditioners. After watching Ford, George Lucas realised he was the perfect Han.
Trivia: Luke's line "I can't see a thing in this helmet" was not scripted. Mark Hamill said this to Harrison Ford when he thought the cameras had stopped rolling. But, the filmmakers decided to leave the line in.
Trivia: Luke says "Prisoner transfer from block 1138" on the Death Star - a reference to George Lucas' film THX-1138.
Trivia: When George Lucas was mixing the American Graffiti soundtrack, he numbered the reels of film starting with an R and numbered the dialog starting with a D. Sound designer Walter Murch asked George for Reel 2, Dialog 2 by saying "R2D2". George liked the way that sounded so much he integrated that into Star Wars.
Trivia: Denis Lawson, who plays Wedge Antilles, is the uncle of Ewan McGregor, who plays Obi-Wan Kenobi in the prequels.
Trivia: Mark Hamill annoyed Alec Guinness so much on set (because of his youth and excitement) that Alec paid him a dollar to go away.
Trivia: C3PO was named after a post office which is located at reference C3 on a map of Lucas' hometown. R2-D2 is an abbreviation of 'Reel Two, Dialog Two'.
Trivia: During Han's conversation with Greedo, the line "Even I get boarded sometimes - do you think I had a choice?" was lifted from his conversation with Jabba that didn't make it into the original release. If you pay attention you'll notice that when he says that line the camera is on his hand unsnapping the holster of his gun, not on his face. When the Jabba scene was put into the Special Edition they left the line in both scenes, which is why the Jabba scene seems a bit repetitive.
Trivia: All the dialogue when Han is on the console talking to some of the commanders was all ad libbed. Harrison Ford deliberately didn't learn the lines, so that it would sound more spontaneous.
Trivia: 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.
Trivia: The film's screen tests were spoofed in a 1997 episode of "Saturday Night Live," which included Kevin Spacey playing Christopher Walken auditioning for the role of Han Solo. Walken really was considered for that role before Harrison Ford was chosen. Spacey also played Walter Matthau auditioning for Obi-Wan Kenobi and Jack Lemmon auditioning for Chewbacca.
Trivia: The reason why C-3PO lets R2-D2 go in front of him as they enter the Skywalker's residence right after being purchased from the Jawas, is because the set guy operating R2-D2 by radio control kept on hitting C-3PO from behind and pushing him down the stairs, so in the final shot, C-3PO suddenly steps to the side, waves R2-D2 past, and the shot cuts out right before R2-D2 goes flying down the stairs.
Trivia: During the trash compactor scene, Mark Hamill (Luke Skywalker) held his breath so long that he broke a blood vessel in his face. That's why many of the shots show only one side of his face.
Trivia: While filming the desert scenes, Anthony Daniels' C-3PO costume kept falling apart, especially the legs. In many of the close-ups, Daniels was in costume only from the waist up. Notice as Luke and Obi-Wan pick up the damaged droid following the Sand people attack - the film cuts to the next scene with an upward vertical wipe, to avoid having to show his legs.
Trivia: When Ben Kenobi is deactivating the tractor beam, the set Alec Guinness was on was only six feet above the floor.
Trivia: Carrie Fisher has stated that her scenes as Princess Leia with Grand Moff Tarkin - Peter Cushing - were not easy to play. During filming, Peter, as Tarkin, would speak so demeaningly to her. When the cameras stopped, he would converse with her in such a gentlemanly fashion and she would find it hard to play her part against him when filming commenced again.
Trivia: Peter Mayhew worked as an orderly in a Yorkshire hospital before being cast in this film. He won his role ten seconds after meeting George Lucas for the first time; all Mayhew had to do was to stand up.
Trivia: The sound that is made when they power up the Death Star's hyperlaser to destroy Alderaan is the same sound used in the THX Certifier on many DVDs.
Trivia: In the Death Star scenes (yes, all of them), whenever the Imperials walk, you can hear their footsteps. But when Tarkin walks, you can't hear him. This is because Peter Cushing (Tarkin) found his Imperial boots so uncomfortable, he didn't wear them. He wore carpet slippers, so you can't hear him. The only shots in which he can be seen wearing boots are shots in which he remains stationary.
Trivia: 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.