Factual error: No council house in Enfield has a cellar like that.
Factual error: Fireplaces in the house are not those of a 1930's British house, they are the wrong size (more USA dimensions). You'll never see a British tiled fireplace quite like that.
Factual error: A few days prior to Warrens' visit to the Hodgson's family, Janet watches the British comedy TV series "The Goodies" on TV. The episode that she was watching actually aired on December 22 of the year in the UK. Later, when Ed records the interview with Janet, it turns out that it's December the 21st. (00:28:20 - 00:31:25)
Factual error: The school sign, supposedly in the 70s, is showing an 11 digit telephone number. The number should only have nine digits in the 1970s.
Other mistake: In the train scene, when Ed plays the two tapes separately, the first tape says," Help...It...Let...Go, Help...It...Let...Go." The second tape is then played, saying," Me...Won't...Me...Won't...Me." When played together, it should say," Help me, It won't let me go, Help won't, it me let go." Instead, it somehow turns into," Help me, it won't let me go, help me, it won't let me go." There aren't enough words in the second recording to fill or sequence the entire sentence(s). (01:45:00 - 01:49:00)
Revealing mistake: During the scene near the end, at the climax of the film, when Ed is holding onto Janet for dear life outside her bedroom window, as Lorraine rushes over and pulls them back into the house, 'Janet' is a dummy.
Factual error: All four Hodgson children go to Enfield Grammar School. Enfield Grammar School is a single sex boys' school, so the two girls could not go there. In addition, grammar schools in England are secondary schools. While the two girls (aged 11 and 14) are of secondary school age, their younger brothers are of primary school age.
Continuity mistake: In the middle of the movie during a non ghost activity kitchen shot the Pyrex bowl on the top shelf moves slightly from one shot to the next. You can see the full frontal pattern in majority of the movie, however, it moves slightly, revealing where there is no pattern visible on the bowl.