When the hikers are running to an abandoned cabin while a pack of German Shepherd Dogs is chasing them, there appears to be a crew member sitting on a hill in one shot.
After Ranger Tucker watches the TV news report in the bar, the camera is visible in a reflection as it moves towards one of the bar's windows.
When Frank is climbing down the rocks to help his girlfriend Mandy, who is being attacked by a flock of birds made up of several different species (most of them birds of prey), you can see a foot moving in the upper left corner of the screen.
At the beginning of the film, when the helicopter's door is opened, the camera and cameraman are visible in the door's glass window.
Ozone layer depletion affects more than just animals; it also affects plants. Yet in this film, the region's plants seem to be both in good condition and thriving in spite of everything.