Revealing mistakes: When Captain Waggett telephones the Post Office, he is unable to get through to the switchboard operator. Seconds later, he is speaking to Mistress Campbell. He could not possibly do so without the Post Office switchboard connecting him.
Revealing mistakes: Had there really been whisky (or really about anything except air) in those wooden crates piled as high as a person on the rowboats the villagers use to loot the cargo ship, those boats would have capsized or sunk by the sheer weight of the crates.