u can see helicopter shadow in opening sequence

Rating: Null/10 (13 June 2004)

in the opening sequence, when jack torrance is driving upto the overlook, there is a helicopter shot following his car. in it u can see the shadow of the helicopter on the hills below. also a few seconds later the when we get a glimpse of the overlook hotel, u can see the chopper blades in the top part of the screen.
i bet lotsa people must have noticed that. and since kubrick is the acclaimed master, its just hard to believe that that might be an error. any explanations ?
(anishkny)
'There's no reason to become alarmed, and we hope you'll enjoy the rest of your flight. By the way, is there anyone on board who knows how to fly a plane?' -Airplane