When Sunburn shoves Scowl into one of the chain links for the bridge at the castle, we see that the chain is bare. But when she lets down the bridge for the other dwarfelles, the same chain has stuff hanging off of it as seen when the dwarfelles run by it.
When Batso is getting ready to blow out the candle, the part of the rope above the flame has been reduced to a single thread. When he turns around to talk to Scowl, the same part of the rope is a weave of many threads.
Thunderella's eyes change back and forth from brown to blue throughout the movie.
In one shot Marina is at the surface of the lake during the moment Muddy goes on an earthquake tantrum, later in the next scene she rises up to introduce herself to Snow White.
Just as Lord Maliss is going to turn Snow White into a stone figure, he ties her wrists together and behind her back. As the dwarfelles come to rescue her, we see a quick shot of Snow White gasping and covering her face with her hands, untied. In the next shot, she asks Thunderella to untie her, her wrists are tied together again.
During the final chorus of Scowl's song "The Baddest", his mouth doesn't move when he says, "I fly in the fast lane. See?"