Found on the flipside of a DVD case:
This film is presented in “Widescreen” format. The black bars on the top and bottom of the screen are normal.
That sucks. I was about to call Blockbuster about this problem.
On a serious note: I see that some people don’t expect to see black bars as illustrated by these articles at Apple (Apple DVD Player: Black Bars at Top and Bottom of Screen and Apple DVD Player: Why Black Bars Surround the Picture).