Errores

When Shannon meets with Endean and Bobi, in subsequent shots his necktie moves from the left to right side of his shirt.

The train announced as calling at Rugby, Leicester, Loughborough, Nottingham and Sheffield would have been running on the Great Central Railway. This closed to passengers in 1960, long before the time in which the film is set. It would anyway have departed from Marylebone Station rather than Liverpool Street.

Although they are supposed to be receiving training in the use of the Uzi sub-machine gun, several of the mercenaries who run across the deck to fire at the floating target are armed with Ingram MAC-10's.

When the oil barrels are cut open a small hole is cut in them and the arms deposited in them. However the entire bottom lid of the barrel is shown as being welded back rather than the small section that was cut out.

The scene at the railway station is set at London's Liverpool Street, made obvious by the Great Eastern Hotel prominently in the background. However, the station announcement says the train is for Rugby, Leicester, Loughborough, Nottingham and Sheffield. Trains do not go from Liverpool Street station to these destinations and did not at the time the film was set. A likelier station for such departure would have been St Pancras.