What is the significance of the cellar door?

from Movie FAQ – Donnie Darko on Rap Genius

Meaning

As explained by Richard Kelly in the Director’s Commentary, it is a vital part of the story.

By entering through the door, Donnie and Gretchen are attacked, which enables Frank to kill Gretchen. This is also shown when cutting to the scene at Roberta Sparrow’s house when the cellar door is shown for several moments.

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