Ben Kenobi: Obi-Wan Kenobi? Obi-Wan. Now there's a name I've not heard in a long, long time. A long time.
Luke Skywalker: You do know him then?
Ben Kenobi: Of course I know him...he's me. I haven't gone by the name Obi-Wan since, oh, since before you were born.
When the stormtroopers break into the control room, the stormtrooper on the right of the screen hits his head on the door frame. On the DVD release they've added a thump when he hits it.
The Imperial officer's uniforms were patterned after the uniforms of Nazi officers to add to their "villainous" image.