At the party at the end of the movie, Sidney James is handed a message. He puts it in his pocket twice.
The cruise ship docks at several ports, from Spain to Italy and North Africa. However it always moors against the same quayside with the same tree standing on it.
When the International cake is cut,the captain is given a large, triangular slice of cake.However the hole it was cut from is thin, and rectangular.
When Esma Cannon is at the table tennis table, Kenneth Williams walks down the steps to the table twice.
The Captain is mixing drinks and pours the failed attempts into a vase. The volume and colour of this liquid is inconsistent.
The doctor is examining a patient who has fainted. He watches her chest and says that she is breathing "in, out, in, out ...", but her chest movement shows she is doing the exact opposite.
When Flo leaves the Captains cabin after mistaking the captains intention Marjoribanks (pronounced "Marchbanks") enters almost immediately and claims that he has just explained her mistake to her however there was not enough time for him to say anything to her.
At the beginning of the film, a clear shadow of the boom microphone can be seen on the chef's hat as he first walks into the scene.