Factual error: In the future it is possible to travel from Griffith Park to central Orange County (around 50 miles) via unpowered hang glider in only 10 or 20 minutes, according to Snake's countdown timer. This would mean the hang glider would need to be traveling somewhere between 150 and 300 miles per hour.
Factual error: When Snake crashes the chopper in the final scene, it is going down nose-first, and just the nose hits the ground. The explosion area would be (approximately) 10 sq. feet and expanding outward from that spot. But the initial explosion is down the whole length of the chopper with the grass exploding into fireballs.