Factual error: Early on the in the movie the period is set in 1960. Danny Green is in a bar with his co-workers drinking Pabst Blue Ribbon beer where a UPC code is visible on one of the bottles. UPC weren't put to use until 1974-1975.
Factual error: Danny Greene has a bomb placed in Shondor Birns' car. As Birns is waiting to cross the sidewalk, the pedestrian walk-don't walk sign is a modern digital sign, that was not around in 1975.
Other mistake: Danny meets the union muscle in the machine shop at midnight, but it's broad daylight as the sun is coming through the windows. (00:13:40)
