There are c.50 quite extraordinary photographs here, courtesy of Richard Beymer.
He also has a short film made at a number of different Twin Peaks conventions.

See them all here: http://gallery.mac.com/richardbeymer#gallery

Thanks to @culturalelite for the heads up. Just brilliant to see these.

     

Click here to download:

These_behind-the-scenes_photog.zip (1620 KB)