The boy who plays Daniel Radcliffe's son is his real godson, casting suggested by Radcliffe himself, which helped him establish an authentic relationship between father and son.
The music boxes and mechanical toys in the nursery scenes were not created for the movie, but were genuine antique toys from the period, loaned to the production by a collector.
The biggest grossing British horror film in 20 years.
The location used for the fictional Nine Lives Causeway (leading to Eel Marsh Island) is Osea Island's tidal causeway situated at the estuary of Blackwater River in Essex, England, United Kingdom. Due to tidal conditions, the cast and crew were restricted to only 4 hours of working time per day at that location.
Adrian Rawlins --who played Daniel Radcliffe's father in the Harry Potter series-- played the same character in the 1989 version as Radcliffe plays in this film.