Factual error: In the scene where there is a train passing, the cars are marked "Burlington Northern." There was NO Burlington Northern until 1970, 7 years AFTER the shooting.
Factual error: When the crew member aboard the Excelsior detects the incoming shockwave, he states, "Energy wave at 240 degrees, mark 6, port". However, when the shockwave hits the Excelsior seconds later, it is coming from her starboard side. (00:04:05)
Factual error: The football game at the end of the movie supposedly takes place at the Los Angeles Memorial Coliseum. However, the overhead shots after Milo is killed show that the endzone says "SAN DIEGO". The end zone paint is red, white, and blue. This footage was obviously shot in San Diego, most likely during the Holiday Bowl college football game, which is held in San Diego in mid-December. (01:36:30)
Factual error: In the beginning when the Mcaffrey brothers' dad is killed, he pushes Scott Glenn (Adcox) into an adjacent room. Then the whole floor explodes - why wasn't Adcox hurt? He should have been blown up with the rest of the floor.
Factual error: A little spoiler about the ending: Bob Hoskins' character saves his life by breathing underwater because he "has his own tank," namely his asthma inhaler. That's not how inhalers work. They are not little scuba diving tanks full of oxygen; they are full of the drug they need to puff into your respiratory system.