When the two kidnappers watch the video supposedly coming from the cameras on their kidnap victims, the video shows the cameras looking straight ahead, but the cameras on their collars are actually pointing down at about a 20 degree angle.
There's no way ELF could carry high-quality audio data, analog or digital, let alone video data. It would sound like a cell phone at best.
Reid says, "The average school bus holds approximately 80 gallons of diesel fuel, making it possible for them to travel up to 550 miles on a single tank," to which JJ replies, "Which is why we believe they're still within a 200-mile radius." Given the fact which Reid just supplied, the bus would be within a roughly 550-mile radius because it could travel up to approximately 550-miles in any direction. Hotch, however, says the bus has a two-hour head start. With a 200-mile radius specified, that would set the bus' estimated travel speed at one hundred miles an hour. Even if the bus made it onto a freeway and traveled at 65 MPH, a 150-mile radius would cover its reasonable range of travel.
Among the TV news vans, one is from WVDO. This station is a Caroline, Puerto Rico, station. They wouldn't have a news van responding to a Virginia news event.
We see the students texting each other using iPhones in the opening scene. The first screen we see is that of Addyson's phone. The message she sent is in a white bubble. With an Apple iPhone, sent messages always have green or blue bubbles. When we see the next phone, the message is in a white bubble (which is correct for the recipient). A shot later, we see the same phone, and the message is in a blue bubble (incorrect for the recipient) and the message that he sent is in a white bubble (also incorrect).
When Garcia says "I reran the last GPS signal of the bus through a proxy server, retracing the route, and it turns out the signal was never disabled, it was masked". A proxy server is used to mask locations and activity on the internet. It cannot be used to unmask it or to reveal a masked or a hidden signal.
When Matt threatens his brother, the gun has no magazine.
When the school bus comes upon the unsubs' vehicle, it is parked in the middle of the road with the hood up. Mrs. Roberts asks the bus driver, Mr. Webster, what is wrong. He responds that it's probably a flat tire. Since the hood is up, he should've surmised that it was engine troubles, not a flat tire.