Continuity mistake: Tad Hamilton is speaking to his agent on the phone in his motel room. While he is lying on the bed he takes off right shoe, leaving his left one on. Then the camera cuts away for a second, and when it comes back, Tad has his right shoe on and his left off.
Continuity mistake: In the last scene, Rosalee catches up to Pete's car on the highway. She pulls up alongside his car at a high speed, causing him to brake severely and run into a post on the side of the road before coming to an abrupt stop. But when he steps out of the car, her car is already parked behind his. He stopped so quickly that she must have taken longer to stop, so her car should be in front of his by the time they pulled off the road.
Continuity mistake: When Tad arrives at his hotel, there is a wall clock behind the desk that reads 7:20( I assume it is PM because the clerk say have a good evening plus when he gets to his room he turns on the TV and a baseball game is on.) However when he gets to Rosalee's house for his 7pm date, her wall clock reads 6:50 pm.
Continuity mistake: In the scene where Rosalee returns to the Piggly Wiggly Supermarket from her date with Tad, the camera shows her standing in front of a register and on the screen nothing has been rung up and it is blank. It shoots to Pete and then back to Rosalee where you can see that at least 20 items have been rung up and the screen is full of prices.
Continuity mistake: When Rosalee catches up to Pete at the end, Pete ironically does a double take twice in sequential shots.
Continuity mistake: When Pete is in the Men's room and Tad walks in to the toilet, we hear Tad lock the door, but Pete manages to open it even so.
Answer: It's Somebody by Bonnie McKee.