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Mistakes

When the three girls are in the white Dodge, ready to leave on a test drive, the 4th girl is in a chair while the car is seen from the side in the background. The car has no silver window frame on the door, yet for the rest of the film, it does have the frames. See more...

Planet Terror actually makes reference to Death Proof. When Tammy's car breaks down for the second time, right before she turns off the radio, a man is heard saying, "Dedicated to our own Jungle Julia, in loving memory." Jungle Julia is a main character in Death Proof that ends up dying, ironically by getting her right leg ripped off.
In Planet Terror, JT slides a pack of cigarettes over to Wray when he first walks into The Bone Shack. The brand name for these cigs is Red Apple, a regular in Tarantino films.