Prince of Darkness (Carpenter). After the enemy is defeated, Jameson Parker is allowed to head into the distance. What did he tell the police who were crawling all over about 10 bodies? 'Ok, Satan's son tried to come thru a mirror but we got this warning from the future...'
If the Xenomorphs were invented in the future by an android, how come there was an ancient Predator temple with a Xenomorph queen in Aliens vs. Predator?
Not only that, but changing the altimeter setting at the airport would have little to no effect on the airliners, which would have had their own radio altimeters, separate from the altimeters using barometric settings from the tower.