Pinhead's fists during the punching scenes are actually the fists of dwarf stunt woman Cindy Sorenson, who had to wear the same fingerless gloves and sweater sleeve to make it appear that it's the fist of Pinhead. Cindy cited the most difficult part of those scenes was to keep her head ducked the whole time while holding the Pinhead puppet on her shoulders and give off false punches at the same time.
The Bodega Bay hotel was a miniature; which was built about the size of a refrigerator. When the filmmakers found a perfect location, they hung the model in the air and used combinations of force perspective in the way to make the hotel appear as if it was actually there.
Leech Woman's mouth is made of foam latex, which makes the mouth appear to be more flexible whenever Leech Woman "coughs" up a leech. Only three quarters of the leech mechanism comes out of the puppet, and then a simple camera cut creates the illusion that an entire leech comes out of Leech Woman's mouth.
The Blade puppet required five puppeteers to operate.
The Asian puppet at the beginning of the movie that is looking out of Andre Toulon's window is actually a real Burmese opera marionette called Zawgyi the alchemist magician.