The Japanese scientist's name is a reference to Godzilla director and Akira Kurosawa's lifelong friend and collaborator, Ishiro Honda.
Unlike the original Godzilla, which was made out of a concrete mixture, Notzilla was constructed out of foam.
Because of the low budget, the filmmakers were not able to create a full scale prop hand of Notzilla like they wanted. They could only afford to make a finger, and had to projected the rest of the hand in background. This was a technique invented for the film.
Notzilla has a zipper for a gag. However, real kaiju movies don't make general use zippers. Instead velcro, hooks, actors sewn inside, or latex fitting together is used.