That's it, no more of this "OMFG HIGH DEFINITION HAX THE FUTURE IS HERE" shit.
First of all, there's 1280*720 and 1920*1080. Both are referred to as HD in most commercials, where they're talking about how much you need a new, shiny EYCH-DEE TEE-VEE. This is (according to JewTubers) 1280*720. If you want a shorter name, refer to it as 720p. Not HD.
Second of all, if you think that's a 720p movie, get your damn eyes checked. Even on full screen, that's still nowhere near 1280*720.
Edit: Apparently, the actual videos are in 720p, even though that's not the resolution YouTube renders them at. Interesting.