We see the giant bat creature pin Abe to the ground, then the shot cuts away for a moment and then cuts back to the bat but Abe is now on his feet and several yards away from the creature when there wasn't time for him to get there.
After Hellboy defeats the Heads in the forest, the professor crushes the head figurine and it turns to ashes. When they cut back to the scene of the professor, he is shown knocking the heads off the scroll.
The number of strings on the Koto of the Spiderwoman changes between shots.