This may be a duplicate, since I don't know what this is actually called. I just watched the James Bond movie GoldenEye (1995) and the final scene (almost) of the movie prompted this question. James and Natalya have just escaped the explosion of the antenna base. The rise as Jack Wade strolls up. After the standard Bond witticism, Jack pumps his arm and says "Yo! Marines!"
A bunch of US Marines (we assume) in ghillie suits pop up where we didn't see them. This I get. However, at the same time, in the background, three (or more) Bell Huey helicopters descend into the shot.
OK, I get that Bond (and us) didn't see the Marines hidden around him, but the helicopters? No way. They weren't even Black-hawks modified for quiet use (which are still pretty noisy). So, we, as the voyeuristic viewers of the scene are supposed to 'believe' that they were hidden from sight and sound, even though they were simply up and off screen.
The same technique is used in some scenes where a protagonist might be 'sneaking' through some bushes... to the point of view of the camera, they are sneaking, but to the point of view of the people actually filming the scene? There they are, plain as day, with absolutely nothing hiding them.
What is the technique, if it is such a thing, called?