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Behind the Scenes:
On the First disc, enter the "Special Features" Menu. Highlight "Bloopers" and press LEFT twice. This will make Spidey's eyes light up yellow - hit ENTER for a short featurette on the recording of the unique music made for the DVD's blooper reel.
Reported by: jesse sanchez

Behind the Scenes:
On the Second Disc, enter the Featurettes Menu, and highlight "The Science of Sound." Press RIGHT, and the image of several pumpkin bombs will appear - hit ENTER for a short featurette on the process of recording ADR for the movie.