The car used as Frank's car actually belonged to 'Robert Severson'. It would not start the day of shooting, so in the end of the film when it pulls out, it is actually being pushed from behind the bushes by 'Brendan Burke' and 'Robert Severson'.
Most of the film, including scenes at the Psychiatrist's office, was shot at the house where 'Ron Warner' was living at the time.
The movie being watched on the television is the 'Ron Warner' - 'Scott Cullmann' documentary "Momo The Missouri Monster."