Continuity mistake: Rachel's father kills himself after returning home from the Vietnam war (presumably in the early 70's) addicted to morphine. The problem with this is that he kills himself in a 1978 or '79 Ford pickup - Ford did not produce any pick-ups with square headlights until those years.
Revealing mistake: When Nelson first undergoes the experiment, the doctors use a small mask to put him to sleep. When he is supposedly waking up, Rachel asks Randy to help her with oxygen. He hands her the same small mask they used the first time ie. anesthetic. Just for a second she has a look on her face which says "this is the wrong mask" and she tries to hide it with her hand. For the whole rest of the film, the other doctors use a bigger mask when giving oxygen.
Question: Just before Lebracio goes to the subway to find the ghost of Billy Mahoney, he crosses the street and about a dozen bicyclists come whizzing past him. Was this a hallucination? If so, why would he have a hallucination like that? If it wasn't a hallucination, what the heck are a bunch of racing bicyclists doing on a wet street that late at night?Matty Blast