 In real life, Joey Coyle (qv) and the mobster did not force the  car into water, but simply drove to New Jersey and abandoned it.  Also, in real life, three people saw Coyle find and take the money,  unlike in the movie where the movie Coyle does stop to check to see  if anyone was around when he found the money and sees nobody (in  fact in the movie a homeless boy saw him, but was hidden from view).