Factual error: The first shot of the calendar shows two days numbered as 20 and March ending on the 24th. In the following shot it's fixed.
Factual error: The term mayor of Paris was abolished from 1871 till 1977. But we see Victor Maynott wants to join the mayor campaign in 1910.
Factual error: When the gang follows Ben Ravencrift home, they cross over a long bridge supposed to signify Brooklyn, but is in fact, The Golden Gate Bridge in San Francisco.
Factual error: The drum kit that Courtney plays at the concert is wrong. It has too many cymbals, two bass drums (one is unneeded) and she didn't kick the pedals to play the bass drum and cymbals.
Factual error: When the boy sends the letter, it already has a postmark.
Factual error: Steve Trevor tells Aquaman that he is a Colonel in the US Army. But he is wearing First Lieutenant bars on his uniform.
Factual error: Even if he was falling hard, Mandible still would've survived hitting the overturned root, as ants do not have much body mass.
Factual error: If there was that much of a famine in the pack, the Omega wolves would surely have already died of hunger.
Factual error: When Merlin and Arthur are squirrels Merlin says squirrels mate for life, which is not true. Squirrels are promiscuous.
Factual error: At the beginning of the cartoon, Junior is reading a Bugs Bunny strip on his father's newspaper. Later on in the cartoon, Henry discovers that the newspaper he was reading was dated in the year 1928. This is ten years before the Bugs Bunny character was created.
Factual error: The film gets basic physics wrong while trying to depict relativity. Buzz Lightyear leaves T'Kani Prime for a trip around its sun, travels with near-light speed, and returns four years later. This could only have happened if T'Kani Prime's sun were at least two lightyears away! It gets more ridiculous. Buzz's last trip takes 26 years, even though he has traveled at faster-than-light speed. Overall, T'Kani Prime is experiencing either a mysterious time slow-down or a rapid orbit expansion.
Factual error: The female Frankenstein tries to set Dracula up with during the wedding reception is referred to as his "right arm's cousin" but the big arm that looks like Frankenstein is her right arm. (00:08:10)
Suggested correction: Frankenstein wasn't saying she had the other half of his right arm (i.e. his left arm), just that the 2 arms came from 2 people who were cousins.