Though Gillie doesn't have a change of clothes, she is wearing different jeans, with horseshoes on the back pockets, during the pony riding scene and again when getting on the pilot boat.
When Superintendent Graham is taking Gillie to the ship, the number plate of the following police car changes between scenes.
When Superintendent Graham has to spell out the Polish sailor's surname, he spells it "Korchinsky", but when the sailor (Horst Buchholz) signs his name, he spells it "Korczynski".
When Gillie was hiding in the ruins while being chased by three men, a close up shot showed her lying down on the pile of rocks with her left hand in front of her face. In the wider camera angle from above, her left hand was on her side. The return to close up shot showed her left hand back in front of her face.
There were five shots fired. Later a policeman says that 'all four shots were fired from this gun'.
Gillie drops her cap bomb outside William's flat making it go off with a loud bang, she then runs up the stairs and hearing a row in Anya's room looks through the letter box and sees George shoot Anya. In fright she drops the cap bomb and it goes off, yet she hadn't reloaded it.
The police would not endanger the life of a child by getting her aboard the cargo ship via climbing up a rope ladder.
Instead of dropping it in a gutter, the dock or something, Bronek 'hides' the crime weapon (Barclay's revolver) in the adjoining room of the sailors' pub. The gun is so superficially hidden that it is found within a very short time and the police can present Barclay his 'lost weapon' for identification.