www.boat-ed.com. This Boat-Ed safety course video is an animated review of boating and navigation rules at night. Also explains and identifies stern, starboard, port, and masthead lights and what they mean when boating at night.
The error in this video is that the graphics show an incorrect viewing area for the sidelights (aka, the red and green "nav lights"). By regulation, the red and green colors should be visible when viewed throughout the arc from Zero (dead ahead) to 112.5 degrees off the bow. These errors have been brought to the attention of the video creators, I know, because they are depicted correctly in the current version of the video that I teach from.
