When Michelle goes back to Chuck's apartment he is lying on the floor after having been attacked with his head pointing towards the fireplace, but when she enters the room his body is now pointing away from the fireplace.
The tattoo on Michele's arm is "PW5817" - this is not identifiable as a Second World War German concentration camp prisoner tattoo.
Chuck walks into a scene-of-crime investigation when he goes back to Armstrong's hotel room where the police are making a forensic examination. Not only do they let him walk all over the floor but he even lights up a cigarette.
When Armstrong leaves his case at Victoria luggage office there is a member of the film crew warning away two elderly ladies who were about to approach the luggage counter where they were filming.
Chuck in the Humber tails the kidnappers' car from North End Road to Fulton Mews, although he was never given a description of their car - only a description of Michele's clothing given to him by the market trader.