When Jess and Melody go into the camera supply store, Jess gives the clerk a claim ticket and is handed a plastic toy-like video camera. This is the PXL2000 camcorder, manufactured in 1987 by Fisher Price (with its usual child demographic in mind). What is particularly unique about this camera is that it did not use any sort of videotape - instead, it captured low-resolution monochrome video and audio to a standard audio cassette (there is a brief clip showing its visual quality when Jess videos Melody, saying "I make movies too.")
Its moody, noir-ish aesthetic has made it highly collectable amongst artists, media historians, and filmmakers - there is even a film festival (PXL THIS) which is dedicated to projects shot exclusively on the PXL2000.
When Dan goes into the pantry and discovers the secret passage behind the wall, the shelf coverings are identical to the shelf coverings in the closet that leads to a secret passage to the Castevets' apartment in Rosemary's Baby.
The bicycle Dan rides appears to be a 1997 Trek 730.