The Make-A-Wish Foundation contacted FX house Spectral Motion with a unique request from a little boy: he wanted to meet Hellboy. And maybe become him as well. And so young Zachary came to the Spectral Motion offices where he found Hellboy himself - Ron Perlman had returned to wear the make-up and outfit, and he had a big burgers, fries and shakes lunch with Zachary.
Very early on in the film’s preproduction, the filmmakers considered putting Hellboy’s giant stone hand on his left arm rather than the right, so as to grant the actor playing Hellboy the full use of his right hand. Ron Perlman turned out to be left-handed, so the filmmakers were able to preserve the Right Hand of Doom.