As per the request to post in this thread asking if the light at 3:53 is a hoax or lens flare….:
BASIC (VERY basic) lens flare. For those not familiar with cameras, a lens flare occurs when the incoming light is so bright it reflects off the internal optics/lenses of the camera and places false ‘bright spots’ on the image being recorded. (This is made even more readily apparent when the camera is pointed down, away for the sun, and the flare disappears, only to reappear a few moments later when the sun is again in the frame.