Factual error: In the beginning of the film, the Dowager Empress Marie states that the year is 1916 and that they are celebrating the 300th anniversary of their family's rule. The 300th anniversary actually took place in 1913. (00:01:05)
Factual error: A minor only has a certain amount of time (typically, 6 months) to invalidate a contract entered into when such person was underage once that person turns 18 (or the age of emancipation in that state). This brings up a plot hole: If the marriage was not invalidated because Samantha Cole was underage, the prenuptial agreement would not be either, and Fletcher could not have used that argument to win the case, since he specifically states that she was seventeen at the time of her marriage.
Factual error: The child Lily grabs an apple from a tree, the tree is an oak. Oak trees don't fruit apples.
Factual error: When Young Hercules makes the pillars fall in a Domino effect, they go both ways. However, if this were to happen, they would stop the domino effect when they reach the entrance to the market, which doesn't have pillars. The pillars are not in a circle, so there's no way they can both stop at the top of the ring, where the pot seller is. The only way for this to work is if Hercules started the Domino effect at the entrance of the market, with pillars directly across from each other, which he doesn't.
Suggested correction: He throws the pillar he holds towards the opposite side causing it to fall as well.
They do a pulled back shot that shows it falling from the top of the ring.
Factual error: In the scene where Priest fires at Spawn from the balcony, a magazine can be seen sticking out of the bottom of Spawn's P90. This reveals it is a fake P90 shell on an Ingram Model 10. The P90 has a clear magazine that sits on the top of the weapon.
Factual error: In the scene where the Professor Phillip first sees his creation (Flubber), he states that Flubber is 77 degrees Kelvin. Theoretically speaking, 77 degrees Kelvin is extremely cold, about -195 degrees Celsius (or -320 degrees Fahrenheit). The professor was handling Flubber with his bare hand at one point so he should've acquired one heck of a cold burn.
Factual error: At the end of the movie, Wally pushes Kyle into the big vat of fudge after he made fun of the Beaver. When fudge is in liquid form, it is extraordinarily hot, and would have burned the child severely.
Factual error: During the battle in the throne room, a soldier is seen hiding behind a pillar. Then Telemachus comes and swings his sword clockwise. However, we see the soldier getting hit by the sword, hitting the pillar, and then falling to the ground. This only could have happened if Telemachus had swung his sword counter-clockwise.