Factual error: The black van used by the Tornado's on tour is a early 70's model. The Austin-Morris badge on the front was only fitted after 1971, this van also has a D registration dating it to 1966, when this tour took place in 1963.
Factual error: The Major and the band are (correctly) summonsed to appear before a magistrates' court for driving without insurance, but then appear before a judge in full robes. Judges do not sit in magistrates' courts.
Factual error: The Daimler hearse used by screaming Lord Sutch didn't start production until 1968 and the one used in the film is a post 1981 model.