After one of the scares, Paul runs out of the strobe light room and vomits. That was real and not scripted. The actor threw up for real on camera.
The film was shot at a real haunted house attraction in Lehighton Pennsylvania called the Haunting at the Waldorf Hotel. This haunt did take over an abandoned hotel just like in the movie.
Producer Joe Bandelli is uncredited in the movie, but plays Diane's camera operator throughout the film in interviews and the final sequence.
Writer/Director Stephen Cognetti is uncredited in the movie, but plays the camera operator with the tour group in the main sequence of the film.
The eye trick Joey does in the movie is his actual eye, meaning he has it between his fingers. Also, he warns others not to try it.