At 32 minute, Adam's car drives up towards a stopping point before the Subiron residence. Johnny runs out of the house to the car just as it pulls up towards a stopping point all over again.
Donald Harron plays "Ray Harris," but the credits list him as "Art Harris"
After Minns made $400,000 on speculations, he wired money to the other conspirators working on the spaceship. It was mentioned that he sends money to PFC Hadley via the "Kansas Bank of Wichita." A fictitious bank is not a problem, but every time the action cuts to Hadley's work the caption reads "Wichita County." Wichita, Kansas is the county seat of Sedgwick County. There is a Wichita County in Texas, but given the Kansas bank this was obviously just a mistake.
When Pvt. Robert Renaldo walks from the taxi that's just brought him to the Wichita County factory, the taxi reverses and hits a piece of fencing. The sound is audible and the actor playing Renaldo automatically reacts to it, half turning to look.
At 35 minutes, Ballard's face is reflected as he turns away from the force field, revealing it as glass.
At 10:30, the license plate on the taxi that drives up can be seen. It bears a California plate for a privately owned (not commercial) vehicle (IET 648), but it's established that the location is Wichita, Kansas, not California.
The feds struggle to find any reason to arrest the four possessed men, completely overlooking that they are still soldiers and that their disappearances constitute going AWOL. Operating under alien influence, they are also now agents of a foreign power.
Ballard later says that Minns was shot at 6 times (a forcefield protects him though). He was actually shot at 7 times if you count them (3 times by the man standing inside the apartment and twice each by the 2 men standing just outside the apartment when Minns opened the door to escape).