Whenever Dr. Roget (Charles Dance) is listening to music it is music from the score composed by Brian May for the original 'Patrick' (1978) picture.
The surname of Ed (Damon Gameau), as revealed by nurse Kathy Jacquard (Sharni Vinson), is ''Penhaligon''. This is a reference to the last name of actress Susan Penhaligon who played nurse Kathy Jacquard character in the original 'Patrick' (1978) picture.
First nudity for Australian actress Sharni Vinson.
Lead cast members Charles Dance and Rachel Griffiths each both worked two weeks.
A number of cast and crew members from the original 'Patrick' (1978) make cameo appearances in this remake. These included actors Rod Mullinar and Grant Page, as well as actresses María Mercedes and Carole-Ann Aylett, and Susan Penhaligon, the actress who had the leading lady role in the original, who does a small voice cameo.
María Mercedes: The actress, who previously had played Nurse Panicale in the original 'Patrick' (1978) picture, as the doctor of Ed Penhaligon (Damon Gameau).
Richard Franklin: The late director of the original 'Patrick' (1978) appears in a portraiture painting in an early scene with cast members Rod Mullinar and Charles Dance.
Grant Page: The movie's stunt co-ordinator, who previously worked as a stunt-man on the original 'Patrick' (1978) picture, as a man with a beard at the pub. Director Mark Hartley wanted to make him up like his bearded villain character from 'Road Games' (1981) which was directed by original 'Patrick' (1978) director Richard Franklin.
Carole-Ann Aylett: The actress who played the mother of Patrick in the original 1978 Patrick picture as a Barmaid.