Factual error: The pirates' map shows a drawing of Tower Bridge, which Pirate Captain sees through the telescope moments later. Construction of Tower Bridge started in 1886, and it was completed in 1894. Queen Victoria was 73 when Tower Bridge was completed, whereas she is in her late twenties or mid thirties here. The sign setting the film in 1837 also makes no sense given this timeline. (00:25:20)
Audio problem: When The Pirate Captain says "This time, it's pay day", his mouth doesn't quite match up with what he is saying when he gets to "it's pay day". (00:16:05)
Other mistake: When Charles Darwin is on the plank, he is pushed into the water. Yet he is completely dry when he is back on the ship. (00:23:00)
Factual error: When the Pirates and Darwin land in London, the Pirates disguise themselves as Girl Guides, but Robert Baden Powell didn't found the Girl Guides until 1910, over 70 years after the film is set.
Factual error: When the captain sleeps in Darwin's house, first half 19th century, the bedroom appears to have electric light that uses a modern light switch. It's somewhat unlikely that this would be completely accidental, but since it serves no evident purpose for the story: mistake.
Continuity mistake: The sign at the start says 1837, but the Royal Society says "playing God since 1847." (Of course, a lot of time could have passed, or the sign could have been wrong, since it was handheld, not to mention the inscription; but there's no indication of, or reason for, either.)
Continuity mistake: On "Ham Nite" The Pirate Captain starts doing his dance with a slice of ham on his sword. But by the time he does the splits, the slice of ham is no longer on his sword, but now on his plate. (00:03:50)
