From video description:
Tips include proper nozzle removal, reducing extrusion filament issues as the human eye may not be able to see 75 micron layers coming out and filament flow can seize, and knowing that the "calibration print" is a super useful "hacking tool" for accomplishing all of this.
Looks like the video is down. Here is a different video:
Here is an old calibration folder at Lulzbot server:
Here is a link to Google Books AO-101 manual with calibration section: