Although the film is set in Portugal, there are continued mistakes using Spanish art, signs and language. They even order Sangria at the bar.
In London, Charles Hood is told to meet Hammerhead in Lisbon in Portugal and is given a train ticket to Southampton, but there is no mention or indication of how he is to get from Southampton to Lisbon.
Hood shows his expertise in fine-art by correctly identifying the artist of each painting displayed in the vestibule of his first meeting. However, looking at 'The Turkish Bath' by J-A-D Ingres, he pronounces the artist's surname with two syllables instead of one.