Factual error: When Tommy goes to Melissa (after the hospital), the porter is refused admittance. In the background, between the '70s cars, emerges a Mercedes from the 2000s on the right corner. (00:56:55)
Factual error: During a panoramic shot while moving down the street in New York City, a modern-looking Starbucks was shown. It was 1973 at this point in the movie. There were no Starbucks stores in 1973 except one in Seattle. See http://www.starbucks.com/aboutus/timeline.asp.
Answer: It's taken from the score of 'Alive', written by James Newton Howard.
Tailkinker