hitokirivader points out the following Star Wars reference on the 'Shaun of the Dead' DVD:

Go to the extras menu, select "Raw Meat," and watch Simon Pegg's Video Diary. It's mostly just the cast and crew fooling around on set, but about 6 minutes in, Simon guides the camera through two parallel fences and says:

Here we are recreating the scene from Star Wars when Luke Skywalker destroys the Death Star. 'Stay on target...' 'Loosen up!' 'Stay on target!' 'I can't maneuver!'

Thanks also to Chris for the alert.