Continuity mistake: Dan set his lighter on top of the pack of cigarettes with their bottoms flush, but a close-up showed the lighter at an angle with one corner protruding past the bottom of the pack of cigarettes. (00:04:52 - 00:05:28)
Continuity mistake: The fourth time Jess raised the cigarette to her mouth, it was about half the length that it was 5 seconds earlier; cigarettes don't burn this fast. (00:47:45)