Goofs

When Sgt. Wilkins and P.C. Thurston go on patrol in the police car, it's registration number varies between scenes, from 892FPC to UUV133.

As PC Constable runs up the entrance steps to investigate a disturbance at No 13, a little old lady passer-by has stopped to watch him. When he then turns and heads back down she has disappeared.

At the beginning of the film, Sgt Wilkins leaves the reception of the station with a large crowd of irate men shouting at the officer behind the reception desk. When Wilkins returns to the reception some minutes later, the irate men repeat exactly the same lines they were saying when he left.

The car that Sgt Wilkins gets into when he "checks on his constables" isn't the same one he gets out of.

Sgt Wilkins (Sid James) goes into Insp. Mill's office and in close up a shot from slightly behind looking at the inspector he's standing with his arms folded but when the camera looks over the inspector's shoulder Wilkins is leaning forward with his hands on the desk.

At the end of the film when the four trainee constables find the villains hideout in the derelict house, PC Potter falls from the landing to the hallway. You can see the mattress put there for him to land on.

Called into the inspector's office Potter (Leslie Phillips) puts the wrong papers on the fire, they're quickly pulled off alight. Potter grabs a fire bucket and throws the water over the papers but instead it goes over the sergeant and steam is briefly seen rising from has uniform indicating that the water was warm.

When Hawtrey and Williams are in front of the mirror dressed as women, Hawtrey is only wearing one earring, not 2 as he should be, and the coat That Kenneth Williams is wearing still has the tag attached to it.

Throughout this film the caps and helmets of the police officers carry badges bearing the imperial Crown (King's Crown). The film was made in 1960, eight years after Queen Elizabeth the second's accession to the throne. Therefore all badges should have carried the Royal Crown (Queen's Crown.)

When PC Charlie Constable believes he heard a murder being committed, he blows his whistle outside the apartments and then enters the apartments. A short time later Sgt. Frank Wilkins and Thurston arrive in a police car. Wilkins and Thurston could not have heard PC Constable's whistle or know which address he was at.