Revealing: In the crypt scene, Van Helsing, as you can see, cuts off Lucy's head. But when the head pops off, you can see that where there should be blood, guts, flesh, etc., there is only some white blankness.

Continuity: Towards the end of the movie, Winona Ryder chants something as the men race to the Castle in the snow. Keanu Reeves or Bill Campbell - I don't know which - falls to the ground and someone goes to pick him up. I bet the crew made a bad mistake in editing. You can hear Winona say the first 3-syllables out of the 8-syllable chant. The shot doesn't change so much that you are out of earshot.