Speaking of sounds, there was an episode of CAPRICA that depicted a thunderstorm correctly. You'd see the flash of lightning, and then you'd hear the sound of thunder a few seconds after the flash. It's probably the only time I can think of off the top of my head that anyone remembered light is faster than sound.
I saw something recently that got the time delay right, but I can't remember what it was.
The most egregious example I've seen of sound editors ignoring the time delay on sound was an episode of The Young Indiana Jones Chronicles. It was an explicit plot point, spelled out in dialogue, that the characters were using the time delay between the sight and sound of an artillery piece firing to calculate how far away it was. And yet the sound editors still put in a "boom" sound effect at the exact instant the cannon fired!