In the first episode Neff tells Vivian that Anna's room cost $1700 a night but when she looks up Anna's account on the computer it shows a total of $33,000 after 47 nights. Just the room comes to almost $80,000 not counting everything else she was shown charging to the room.
Neff says that Anna is staying in Room 517. However, her hotel bill says she is in Room 507.
When Neff asked the Rosen brothers about Anna she mentions that her room number is 517. Later, while checking Anna's bill on the computer it says room 507.