I wonder if Monsieur Poirot (Peter Ustinov) noticed the massive Guerlain flacon montre sitting on a shelf in Linnet Ridgeway’s bathroom, while inspecting the heiress’ cabin on the Karnak steamer. Too bad the front sticker was scratched out: we will never know what cologne she used.

Using a flacon montre here is not 100% accurate: if we assume the novel is set before 1937 (year in which it was published), the choice is not accurate because this bottle was introduced on the same year. In any case, this is another example of “partial inconsistency:” this bottle was not available at the time in which the story was set, but it was at the time in which the film was shot.