Factual error: The sheriff mentions that they don't have a license plate on the front of their vehicle, but according to the aliens' map device, they're located in Michigan, where a front plate is not required.
Factual error: After trying to get his balloon back, Carl Jr. falls and breaks his arm. The ambulance that picks him up has a modern-day electronic siren, when in the 30's it would be a mechanical siren and would be much smaller.
Factual error: The alligator mentions wanting a Bananas Foster. This dessert was invented in 1951 but this movie takes place in 1926.
Factual error: When they arrive at the airport to go to Hollywood, they show them arriving at Birmingham Airport where they are to start their 11 hour flight. However, Birmingham Airport doesn't do flights to LAX.
Factual error: When the super-scrambled monster is destroying the town, everything it destroys falls down completely, despite the fact the monster only hits one side of it. (01:00:15 - 01:04:40)
Factual error: The movie is about the 1957 little league world series. In the scene near the end when the factory workers in Monterrey Mexico walk off the job so they can listen to a broadcast of the game, there is a blue 1959 Ford station wagon parked on the street.
Factual error: Paul has hypoglycemia. When he eats the lollipop off the floor and gets up instantly, this would never happen as it takes the sugar a while to get into the bloodstream. He would never be instantly cured.
Factual error: At the beginning Scrooge is seen signing Jacob Marley's death certificate in the year 1836. English Birth, Marriage & Death certificates didn't come into being until 1837.
Factual error: The lead song, "Lollipop," wasn't written until 1958, seven years beyond the chronological order of the movie.
Factual error: Near the end, no one in the hall realizes that a real diamond cannot be destroyed by a bullet. Also, even if it was a fake, it couldn't be blown to smithereens with a single gunshot.