In the scene where Col. Fielding is sending the team into the mine, his line was "I realize it's risky, son, but those are my orders". As an homage to the two stars of the film and the TV shows they appeared in, the line was changed to "It's never easy, son, but we have no choice." ("It's never easy" was a recurring line in Hercules (1998), and "We have no choice" is a recurring line in 24 (2001))
There is a reference made to "the Makati Incident," near Mount Pinatubo during the summer of 1971, where supposedly the entire village of Mikati, Philippines were killed by a release of poisonous gas. In actuality, Makati City is 60 air-miles southeast of the volcano, just on the other side of Manila. The incident is fictitious.