The first movie showed Frosty ceasing to live when his top hat was removed, but in this movie he takes the hat off multiple times and stays alive.
In Ms. Carbuncle's class, when the girl with the brunette bob is first shown, she wears dark green pants. In the next scene with her, she wears a dark green skirt. In her other scenes, she wears pants again. Also, her eyes switch from being beady to being normal, regular, and realistic in between shots.
The number of students in Ms. Carbuncle's class and the positions where they're seated keep switching while also appearing, and disappearing, making it inconsistent.
Holly takes an entire turkey from the family fridge to school, but when Miss Carbunkle asks her what's sticking out of her desk, only the turkey's drumstick is shown.
In Ms. Carbuncle's class, the girl with the brunette bob and in the light pastel green shirt, and dark green pants isn't there. But when most of the class is shown sleeping as Charles explains the importance of winter, she suddenly appears sleeping as well.
When Frosty starts melting, Holly and Charles point out that there isn't any more snow on the ground, when in fact there is.