First, of course are some of the original trailers for the film:
And here are a few videos offering some behind-the-scenes glimpses of the technicians at effects company Amalgamated Dynamics, Inc. creating the graboids for the film:
And here's a portion of a Q&A with screenwriter S.S. Wilson that includes some rare outtakes from the film.
And here's a link discussing the exhibit of Tremors props at the Lone Pine Film History Museum in Lone Pine, CA.
Enjoy and thanks for listening!