Continuity mistake: When the Copelands (as the Wilsons) are shopping and Karen is helping Marcus into his clothes, Marcus says he is size 14. The shot showing the back of Karen before this shows her right pigtail hanging over both sides of her shoulder. The next shot showing her face shows it is all behind her shoulder.
Continuity mistake: At the "slumber party" scene where Marcus (as Tiffany) is cornrowing Karen's hair, in the first shot, only about three cornrows are complete. Then, when the camera angle comes back to them, all of her hair is completely cornrowed, which would take longer than just the two minutes it takes in the movie.
Continuity mistake: When Latrell first puts the drinks on the table in front of them, they appear to be two feet apart. However, in the next shot the drinks are only a few inches apart.
Continuity mistake: When all "4" Wilson sisters are on the runway stage, the dragon circles them and then leaves the left side of stage with Marcus and Brittany but apparently does so despite the 3' drop off. You can see that they don't step down or anything as the tail of the dragon seems to step off as if there was stairs or a platform that's simply not there.
Continuity mistake: When Kevin is wrestling with the dog at Latrell's house, the dog that bites his right leg right below the calf disappears temporarily when we see Kevin on his belly from a front shot.
Continuity mistake: When the real Wilson sisters show up toward the end of the movie, there are no visible marks or scars on their faces that would account for the scratched up nose and a busted lip. The busted lip would have darker color scab and the nose would have had at least a scratch line in a darker color which would definitely show on their light complexion.
Continuity mistake: When Kevin and Marcus first arrive as the Wilson Sisters, Kevin as Brittany is wearing backless loafers but when they enter the hotel she is wearing Uggs.
Answer: The song is "A Thousand Miles" Performed by Vanessa Carlton.
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