Continuity mistake: When Paul D. arrives at Sethe's house for the first time they sit down on the porch. In all wide shots her two stiff braids are behind her shoulders, in all close-ups they are in front.
Audio problem: Some time after Paul D. has settled down at Sethe's, she comes home and knocks on the door. Denver calls out "Who's there? Mama? Mama?", and the second time she calls "Mama?" her mouth isn't moving.