Goofs

About 7 minutes from the end, the peeler/copper says to George Bone that a man (Bone) was seen getting singed climbing down the ladder from the bonfire but the bonfire wasn't even lit when he climbed down from it earlier in the film.

While discussing the Thuggee knot used for strangulation, Dr. Middleton claims that members of the Indian cult of Thuggee have committed strangulation murders recently in London. There is no record of any Thug strangling a person outside of India; furthermore, the cult of Thuggee had been completely stamped out decades before the Edwardian time frame of the film.

Although the film is set in London, its US studio production is revealed when several of the extras speak with American accents, particularly the children collecting 'pennies for the guy'.

After George takes the curtain cord and leaves his house in a trance when he attacks Barbara, he steps in a puddle. The disturbance of the water freezes unnaturally after he steps in it.

At the end, George is taken out of the concert room and into another room. There he is apprehended and is about to be taken away. However, he grabs an oil lamp and throws it against the wall, starting a fire in that second room. George flees to a vantage point where he can continue to listen to his music. Attendees become aware of the fire and start to flee. As of yet there is no fire in the concert room, and George tries to stop them from leaving that room. In the jostling, another oil lamp on a table is knocked over, and starts a fire in the concert room. But just a moment before that table with the oil lamp is knocked over, flames shoot up from the floor clearly demonstrating that the studio's pyrotechnics started the fire in the concert room, not the oil lamp from the table.

The title of Patrick Hamilton's novel, 'Hangover Square', is a play on words based on 'Hanover Square'. It is not meant to be Bone's actual address as it is in the film version, where a street sign marked 'Hangover Square' is seen.