Meet the Browns (2008)

Continuity mistake: When Angela Bassett is at the babysitter and the babysitter offers her a sandwich, Angela gets upset before she can take a bite of the sandwich. The babysitter yells at her to eat. Angela picks up the sandwich, and it's whole. A quick closeup of her putting it in her mouth, and there is a bite taken out of the corner side (before she had time to bite it). She then bites next to the corner. There are two small bites. Then there is a shot of the babysitter back to Angela and now there is one big bite in the middle of the sandwich and also there is some lettuce sticking out the top that wasn't there before.