The number of the second batter at the ball game changes from 84 to 53.
The helicopter pilot talks on the radio with no headphones on. He wouldn't be able to hear a thing over the noise of the engine/rotor.
The baseball action is obviously stock footage. Some of the film's characters are shown near a TV camera with a Los Angeles television station's call letters, but the teams playing are from the Midwest and the Northeast.
When an FBI car pulls up at the cliff dwellings, the leg of a camera tripod is reflected in its door.
While the voice-over at the beginning talks about "a remote site in New Mexico" (i.e., Los Alamos), the footage shown is actually that of the gaseous diffusion plant ("K-25") at Oak Ridge, Tennessee (producing enriched uranium, U-235).