The movie starts in pre-World War II (1938) Britain yet in early scene at crooked antique dealer Benny Carfield's shop the background view through the shop window shows 1950s vintage cars driving by, such as a 1957 Austin A40 and a 1957 Vauxhall Victor. The police cars used in the chase sequence were Wolseley 680's, also of contemporary (1957) vintage, even though the action was supposedly taking place in 1938.