The line "I need to use the damn phone *now*," was an overdub of a similar line with more colorful language.
After the meteor hit the command bunker the phone lost connection and died, later just before the other meteor was to hit the earth and they were about to launch the rockets, the phone connection was miraculously in perfect working order.
Imogene is attempting to start the truck. The driver's side door is open. A few shots later, the door is closed. No sound of a closing door is heard either.