The high-tech "injector" used several times by Dr. Newmeyer is actually a butane soldering torch sold at Radio Shack stores in the US.
Joe Keyes office is modeled almost exactly on that of Sam Spade's office in "The Maltese Falcon" and the office George Seagal had (as Sam Spade Jr.) in "The Black Bird".
The other device that Newmeyer pushes under Warren Rickman's chin is a cheap stereo microphone.