Corrected entry: When the lava is flowing down the streets, all the glass in the buildings shatter. At that heat, the gas would melt not shatter. The temperature that is used to melt and mould glass is a lot less than the temp of the lava flow.
Corrected entry: When they are trying to stop the lava from flowing down the street, they make a "U" shape in the street with the cement highway dividers. If they had laid the dividers the other way, they would have supported themselves, and not need the trucks behind to hold them.
Corrected entry: When the co-star Anne Heche goes to check out the flow of the lava in the red line tunnel she goes to a payphone and calls Tommy Lee Jones' cellphone but his cell phone burned up in his car. The phone she calls him on is a phone that he took from a news reporter. So how did she get his number to call him.