When the little girl gets out of her seat, the floor of the theater is littered with the shells of sunflower seeds. This is common in theaters in Spain, the film's country of origin, but not in the US, where the film is set.
When Patty asks Linda to leave the cinema, the latter claims she had paid 5 dollars for the ticket. However, when the entrance to The Rex movie theatre is shown, prices are either 6 or 3 dollars.