When Rebecca goes to Alette to retrieve the envelope that she mailed, she rapidly presses the elevator button, and it appears she is trying to go to the 20th floor. However, the floor numbers are listed on their respective buttons, and she is pressing the 17th floor button, but her hand is covering the number.
When Rebecca's friend is trying on the wedding dress, a pair of sunglasses appears out of nowhere. Rebecca plays with them in her hands. They go from her hands to her head, back to her hands, and disappear.
At the Successful Savings office, Luke says he wants Rebecca to go to the "APA conference." Rebecca asks Hayley what the APA conference is. The camera moves to Luke. when it moves back to Rebecca, Hayley is gone.
When her friend is trying on the wedding dress, Rebecca suddenly is wearing a pair of sunglasses out of nowhere. She plays with them in her hands. The glasses switch from hand to hand and then end up on her head... then hands... then gone.
At Rebecca's first meeting at Successful Savings, she pulls out a small notebook and lays a pencil to the left of it. In the next shot, as she pulls out a small pencil sharpener, the pencil is on the opposite side of the notebook.
While Rebecca is in the interview at Successful Savings, the desk behind her is alternately occupied and empty between shots. In one shot, Hayley talking on the phone, with the green scarf on her lap. In the next shot, she is gone. In the next shot, she is at the door, giving Rebecca her scarf.
When Rebecca takes the green scarf to the counter the cashier says "That's $120." Rebecca gives her $50 cash, $30 on one card, $10 on another card, and tried to put $20 on yet another card which was declined. Although she does get the $20 in cash, the total of all of that is only $110. Nevertheless, before the rejected card, there are two more cards (both blue) that she tried before a final one (a golden card) gets rejected. It's very likely at least one of them managed to get charged the missing $10.
The bridesmaid dress had sleeves at the beginning of the movie, but is sleeveless by the end. However, when Rebecca first tries on the dress, you can clearly see it's still in the middle of alterations. Why she took it with her at that point is up for debate, but there is time between the two scenes for the alterations to be completed.
After Rebecca talks to the Nokia man, Janne Virtanen of Finland, he claims "We Scandinavians like her." Although Finns didn't used to consider themselves Scandinavians, this view has been changing more and more.
When Suze and Rebecca are going over credit card statements, Suze asks Rebecca how she will pay off "16 thousand, TWELVE hundred, 62 dollars, and 72 cents" without a job. Both women are very drunk by this point, so she probably is too drunk to read the number correctly.
Rebecca hides the scarf once she knows who her interviewer is, which results in Luke knowing that she was lying about the necessity of the scarf. But hiding her scarf was not actually needed; Luke had never seen it before and had no reason to believe that this was the very scarf she the needed money for.
The goof items below may give away important plot points.
Crew or equipment visible
When Rebecca first throws the block of ice to free her credit card, the block falls from the stove to the floor. As the camera follows it, a crew member is kneeling down, in black jeans and tennis shoes.
Derek Smeath violates the Fair Debt Collection Practices Act at least 4 times: calling Rebecca at work, refusing to leave her job when asked by the receptionist, telling his colleague to threaten her with public humiliation, and his entire diatribe during the television show. However, many *real* debt collectors ignore FDCPA, since it's not enforceable if no one complains, and many debt collectors assume that most debtors don't know about it.