The knot that James uses to secure the suitcases to the car roof is called a "hangman's noose."
The song on the CD that James made for Emma's 14th birthday is called "The Superstitious Twist" and is by a band called COLOUR OF BONE which Sam Stockman (James) is in.
The book "Medieval and Early Modern Period Art in East Anglia" doesn't exist and was created solely for the film.
The book "British Exorcisms of the 20th Century" doesn't exist and was created solely for the film.
The police refer to the events of the film as "Incident at Greyfriar's Hollow. Case number 1150-23".