My wife brought up something about Lego Star Wars II that I forgot to mention. In Chapter 2 of Episode V (The Empire Strikes Back), you are traveling through the swamps of Dagobah when suddenly you build...a green, presumably John Deere, tractor.

From what I could tell, the tractor didn't add anything useful to the scene. It didn't help me accomplish any task that a more...Star Wars-esque vehicle wouldn't have done. While I did get a great laugh watching Yoda bomb around the swamp on a tractor, it removed any possibility of the game feeling like Star Wars.

It came up again in Episode VI, again serving no purpose that an AT-ST couldn't have done, and again completely removing me from the feeling of being in a galaxy far, far away.