The outdoor scenes were shot in Lambeth, a mile away from Pimlico. A set was built on a large World War II bombsite just south of Lambeth at the junction of Hercules Road. This site is now the location for municipal flats built in the 1960s. However, the buildings on the junction of Hercules Road and Lambeth Road can still be recognized from this movie, as can the railway bridge going over Lambeth Road, particularly from the scenes where food is thrown over the blockade.
At the start of this movie, a radio announcement mentions Latin music performed by "Les Norman and his Bethnal Green Bambinos". This is an in-joke referring to Ealing Studios producer Leslie Norman. Bethnal Green was an unattractive area in the East End of London.
After the traders invade Pimlico, a comment is made about it becoming "a spiv's paradise". A "spiv" was and is a minor criminal who deals in stolen or black market goods of questionable authenticity. Spivs were often well-dressed and were noted for offering goods at bargain prices, though the goods were generally not what they seemed, or had been obtained illegally. The term was particularly used for black market dealers during World War II and in the post-war period.
The original negatives of this and other Ealing Studios comedies were lost in the Henderson's Film Laboratories fire in 1993.
A placard can be seen that says "Forget that Cripps feeling". This refers to Stafford Cripps, who was, at the time, Chancellor of the Exchequer.