Donnie: Why do you wear that stupid bunny suit?
Frank: Why are you wearing that stupid man suit?
In the shot near the end of the film where Donnie grabs the keys for the station wagon, you can see a Blockbuster Video member card in a cup. That card design wasn't used until the mid to late 1990's. This movie is set in 1988. Deliberate as it's a product placement, but still wrong. See more...
When Donnie is about to enter the car with Gretchen near the end of the film, he clutches at his stomach as if in pain. Near the end of the film, we see Frank touch his eye after Donnie dies. Both of these are forward memories of pain: one of the deleted scenes features how Donnie dies - a pole goes through his stomach right where he clutches it. And where does Donnie shoot Frank? All together now - the eye. See more...
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Donnie Darko (2001) - 3 easter eggs
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.