Limited Edition Features:
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Video introduction by Guillermo del Toro
Creator audio commentary by Guillermo del Toro (director) and Mike Mignola (co-executive producer)
Cast audio commentary by Ron Perlman, Selma Blair, Jeffrey Tambor, and Rupert Evans
Branching DVD comics drawn by Mike Mignola
"Right Hand of Doom" set visits
Storyboard track
"From the Den" Hellboy recommends...Gerald McBoing Boing animated shorts
DVD-ROM includes printable original screenplay, script supervisor's book, and director's notebook
Video introduction by Selma Blair
"Hellboy: The Seeds of Creation": A 2 1/2 hour documentary on the making of the film, including The Origin of the Comic, Prosthetic Effects, Visual Effects, Set Design, Stunts, and more
Deleted scenes with optional commentary by Guillermo del Toro
Character bios written by the director
Motion Board-a-matics
Animatics
Multi-angle storyboard comparisons
Maquette 3-D character sculptures video gallery
Poster explorations
Trailers and TV spots
Web link to Hellboy merchandise
Filmographies
And more

Limited Edition Features:
Audio commentary with director Guillermo Del Toro
"Hellboy: The Seeds of Creation" documentary
Deleted scenes with optional director's commentary
VFX How-to's
Make-up and lighting tests
Scott McCloud's guide to understanding comics