When Dechamps takes cover behind the plastic trash barrels the bad guys spray the area with automatic weapons. No way those plastic trash bins and the plastic trash bags laying around them will stop those rounds, Dechamps should have been riddled with bullets.
When Deeks and Kenzi head into the wilderness, Beale tells them they were given access to a Forest Service satellite. The Forest Service does not own their own satellites, and if they did, the satellite would not have high resolution thermal sensors that could detect people moving live. It would be used to take lower resolution (~10-30 meter objects) in the visible and near infrared parts of the spectrum.
The agents are at the prison when they learn of the threat to the other two agents, who are in a rural area. They arrive on scene within a couple of minutes. Absent a Star Trek type of transporter, there is no way they could do so as quickly as was shown.