Continuity mistake: When Gary is on his motorbike going to the agency in London he is riding down a country road with trees and hedges on both sides, but when the camera is looking into the mirrors on the bike there are houses at the side of the road.
Factual error: This film is set in the 1960's. The Ford transit van belonging to Russell, the group's roadie, is a facelifted 1971 model.