Continuity mistake: Carrie's skateboard is broken in half after she sneaks off with Flicka to ride it in the city. Later, when she's sitting on the couch depressed about Flicka being gone, the skateboard is in perfect condition. Adding to this is when she gets a new board near the end of the movie. (00:58:00 - 01:14:00)
Plot hole: Near the end of the film, Carrie gets a quarter pipe. The problem is that there is no pavement anywhere near the farm which was expressed explicitly earlier in the film. Because of this, she won't be able to use the quarter pipe anyway, especially since it is about 2 ft at the base so they would definitely need to build the rest of the ramp. (01:14:00)
