the danger of originality

I’ve been catching up on Heroes (the link is to the first episode on NBC’s website). Episode 18 “Parasite” has an establishing shot of Las Vegas, an aerial view in daylight, which I did not recognize because establishing shots of Las Vegas are traditionally street-level and nocturnal, emphasizing the blinkenlights. (Though if the shot were longer I might guess it from the eccentric architecture and the distant mountains.) I knew it was Vegas because Hiro, last seen there, was in the next shot. I wonder what fraction of the viewers were as clueless as I was.