Visible crew/equipment: After the demonstration at the blackboard, the big group of soldiers walk over to the big table with the picture of the world on it. As they walk away from the blackboard, they turn and walk down some steps, and as they do you can see the shadow of a boom mic pole on the upper side of the grey part of the wall.
Continuity mistake: When the school bus is leaving Pacific Tech, the name "Southridge" is painted directly on the front of the bus. When Dr. Forrester finds the wrecked vehicles in the city later in the film, the name "Southridge" is now painted on a separate wooden sign that he picks up.
Trivia: The reporter speaking into the tape recorder just before the atom bomb is used is Paul Frees. Even today (though he passed away years ago) Frees is still the voice of the 'ghost host' in the Haunted Mansion rides at the Disney parks, as well as Ludwig Von Drake and many other cartoon characters.