Other mistake: When Andy is walking by the fountain in Paris, her phone starts ringing. When she checks to see who it is, Miranda's name and number shows up; however, if you look closely, the phone is actually showing an outgoing call TO Miranda, not FROM Miranda.
Other mistake: Andie lives at Broome and Orchard, in the heart of the Lower East Side. Average rent for a one-bedroom apartment (which they have) was $2217 at that time, and Nate and Andie both make barely minimum wage. That rent would have taken their *entire* combined salary in 2006. They didn't depend on help from their parents, since Andie's surprised when help arrives. And the apartment wasn't rent-controlled; Andie and Nate aren't from New York.
Suggested correction: This submission is making assumptions. When is it stated that both Andie and Nate are earning "barely minimum wage"? They may not be upper-middle-class, but their two incomes are never described as "barely minimum." In one scene, the friends raise their drinks in a toast to "jobs that pay the rent." Also, Andie might be surprised to receive money from her father, but we know nothing about Nate's family.