The countdown clock reads 2:10 when the technician fails to shut down the missile. Halvorson tries to help. The clock now reads 1:10, but less than 30 seconds have ticked by. It should read approximately 1:45 until lift-off.
David has commonly carried a snub nosed, .38 caliber blue steel revolver in a leather shoulder holster. However their is never any evidence that he carries any spare ammunition. Only the 5 rounds that are in the cylinder. Each time he has to use his gun, with usually multiple rounds fired, he never re-loads the revolver.
Despite the fact that Ellie Markham is an alien she at no time shows the mutated finger that is said to be characteristic of aliens.
The circular disc shaped object that has flashing lights is usually used to kill humans by placing it on the back of their neck. It then causes a cerebral hemorrhage. However it is now used more as a communication device.