Another possibility is that screen captures, especially video screen captures, were created using a Mac that can output its display to a television, such as a machine using the Apple TV adapter (a Focus adapter rebranded) or a Mac with onboard video output (like the 660av/840av) hooked up to a video recorder of some sort. I screen-grabbed my pismo this way once. (using the video output hooked up to a Canon GL2 DV camera.)