Continuity mistake: Ben is eating Chinese food and takes a sip of his soda. From the opposite angle, he is already lowering the drink.
Continuity mistake: When Cassie arrives at the barbecue, a friend cries her name and extends his arms open wide. From the opposite angle, they're just slightly opened.
Continuity mistake: When Cassie arrives at the BBQ, Ben walks behind the man in an orange shirt towards her. Shot changes and he is a meter behind, repeating all previous movements.
Continuity mistake: At the BBQ, after Ben is given the spatula, Cassie looks at the woman on her right. A shot later, she is looking to her left.
Continuity mistake: After Anya tells the girls to eat quickly, she starts lifting a French fry to her mouth. A shot later, her hands are down and the fry is gone.
Factual error: This movie takes place in 2003, but in the Grand Central scene, you see Ezekiel outside with a clear shot of One Vanderbilt behind him, built in 2020. (00:38:05)
Continuity mistake: At the diner, after the girls decide to talk to the boys, Mattie stands up, and the blonde guy turns his head towards them. A shot later, he is facing ahead and turning his head the opposite way.
Continuity mistake: At home, when Cassandra reads her mother's diary, the position of both of her hands changes in every shot.
Continuity mistake: When Cassie wakes up the girls, Julia's leg is raised. A shot later, it's lowered.
Continuity mistake: When the girls sit down at the diner, the waitress heads from the counter towards the entrance door. A shot later, she's suddenly 15 metres to the left, waiting at a table. Angle changes and she's walking towards that table again.