Other mistake: In the intro to the Pastoral Symphony, the narrator identifies the deity who cloaks the world with Night to be Morpheus, who is the Greek god of sleep and dreams. However, the character in the animation is fairly obviously female, with long hair, eye shadow, and lipstick. My theory is that the character was intended by the art team to be Nyx, the Greek goddess of Night. Night would be a more likely candidate to be making it nighttime across the world, while Morpheus would be more likely to put people to sleep or send them dreams.
Factual error: When Kharis is being examined by Petrie, he says that the lines on his face were caused by him being buried alive. In the next sentence he goes on to say that Kharis shows the best example of the embalmer's art that he has ever seen. Strange - if you're planning on burying someone alive you wouldn't embalm them first - that process would kill them!
Continuity mistake: As the crew of an English ship are crouched down on deck prior to a battle with a Spanish galleon, one of them stands up and moves to the other side. As he does so part of the background projection (ocean and sky) is shown on his back.
Continuity mistake: In the first fight scene aboard the boat, Ace's hat falls off his head. He then breaks through a door and falls down. As he stands up, the hat reappears on his head.
Continuity mistake: Near the beginning Harriet Vane produces tokens for herself & Lord Peter Wimsey of miniature handcuffs with one cuff "open to symbolise we're giving up on crime". She puts hers on as a bracelet. Immediately after & several times throughout the film it's clear hers is a set of closed handcuffs.
Other mistake: Noah, the brother, just disappears from the movie with no explanation at all.
Continuity mistake: Baxter and Beecher are riding in a horse-drawn wagon. As they go across a bridge, the train carrying the Marx Brothers approaches. Baxter and Beecher leap off the bridge, one jumping to the right and one jumping to the left, but they are side by side when they land in the river below.
Continuity mistake: Trying to figure out how to move with the new heavy weighted horse shoes on, Spunky trips up all over himself and winds up spinning on his belly at the barn entrance. When he stops, he is facing the camera and his body is diagonally facing into the building. Then the camera cuts back as the peddler returns and suddenly Spunky is diagonally facing out of the building. (00:04:35)
Continuity mistake: When Porky is searching for his contract in the waste-paper basket in Leon Schlesinger's office, he leaves some paper on the floor. But when Leon tells him to go back to work, we cut to Porky and the paper has gone.
Continuity mistake: Watch the hinges when Goldilocks is at the wolf's house. In some shots they are on the front door; others they aren't.