When the hospital intruder takes photos of the boy being treated for a gunshot wound, he chooses one with few staff around him to make him seem alone by zooming closely in on the bed, though the foot of a nurse is still visible. However, when he posts the photo, the shot is no longer zoomed in, and there is a curtain where the nurse and another person had been standing but were previously cropped out.
When the "child" runs into the clearing, there are several FBI agents present. One shoots the child. Another agent runs to give him aid. Out of nowhere, several anti-government men suddenly surround the child and the one agent, pointing a gun directly at the agent's head. The other FBI agents should have seen them running from the woods into the clearing and would have had plenty of time to shout a warning to the one agent, or to even fire warning shots to stop the men from approaching.