Factual error: As the Thug Zombie is on top of the lawnmower and is getting hacked to bits, his body parts don't fly off. E.g. his arms would've flow out everywhere when the blade reached his shoulders, and the same goes for his head.

Continuity: When Lionel's mum gets bitten at the zoo, the colour of her sleeve material changes from black/dark blue to light blue.

Continuity: The zombie baby keeps changing size throughout the movie.