Continuity mistake: When Syd is talking to her moronic handler at the magazine stand, when he says "who do you think you're talking to?", shots of him show Syd facing straight ahead, but shots of her show that she's turned towards him.
Continuity mistake: In the fight scene between Sydney and Anna, Anna comes running in with her hair tied back. Her hair changes several times between being up in a ponytail and being down. (00:23:00)
Answer: Bad Day by R.E.M.