As a kid, I saw Rear Window somewhere in the late 50's-early 60's in a movie theatre (on a double bill with the remake of The Man Who Knew Too Much). The big immersive screen conveys the theme of voyeurism far more thoroughly than a small tv (or cell phone!) screen. When you watch the movie on a small screen, there's no difference between seeing Jeff and seeing what Jeff sees. On the big screen, you are seeing the apartment building in front of him AS he sees it; you don't see anything around the building. The camera closeup on an individual apartment or the yard in front of the building for example enacts Jeff's subjective or telescope-enabled focusing on that detail. The audience is as much of a voyeur as is Jeff.