Remember the part when Jonathan/Nick and Libby are in the graveyard? Jonathan/Nick knocks Libby's head against a column, she passes out, and then he throws her in the mausoleum. (He does NOT put her in the coffin- he just throws her on the floor.) Then you see him leaving before the scene changes. A few scenes later Libby wakes up and she is inside the coffin. He left her on the floor BESIDE the coffin, not in the coffin. So how did she get in it?