When Fraser and Christina are saying good night, Christina's room number changes from 1823 to 1832.
When Fraser catches the matchbook in front of the incinerator, he opens it with his thumb, but in the next shot he's holding it open with his index finger.
When Fraser is pointing out the facts to Janice about her gun, he is, in fact, wrong. While she does shoot at him 6 times in the incinerator room, if you listen and watch carefully, she only shoots at him 6, not 7 times, in the corridor, totaling 12 shots, not 14, of the 15 shots in the chamber of her Baretta. Therefore, Janice would have 3 shots, not 1, remaining in the chamber, leaving her 1 bullet each with which to shoot both Fraser and Christina, at least injuring, if not killing, one or the other.