When Birkett & Saunders are driving to Rotherhithe to visit Jordan Barker, Birkett is driving. But when they park, Birkett gets out of the passenger side & Saunders gets out of the drivers side.
When Inspector Birkett is questioning Herter at the nightclub, he refers to "Hammond Barclay". Elsewhere in the dialogue, and in the end credits, the character's surname is Barker.
At numerous times in the film, in various locations, an identical sound effect of a two-tone train horn is heard, with no natural variation in the lengths of the two notes from one instance to another.