Continuity mistake: Towards the beginning when the gang is breaking the door chain and lock to the cemetery, the chain is still hanging inside two door notches after the lock is broke, as soon as the door is pushed and the camera changes view to inside the cemetery, the chain is gone. (00:14:40)
Continuity mistake: Ernie is working on a cadaver when Burt arrives. After they cremate the body parts Burt brought over, there is one more shot where the feet of the cadaver can be seen under the blue sheet on the table. The next time we see the table, it is empty. It is never seen or referred to again.