Other mistake: The film is set in 1931. One of the characters uses the phrase "plenty of nutting." This phrase comes from the song composed three years later in 1934 for the musical Porgy and Bess.
Other mistake: When Lorry driver goes around the back to put the door up, you can see the type of lock, but when they zoom in, it's like a peg you slot in, then when they zoom out it's the other type of lock. (01:19:16)