There's no mention of digital sensors or crop factors which is probably a good thing, since the video is already 18 minutes long.
Here's a list of films mentioned in the video (along with notable people / inventors / technologies). The films are all worth watching - many could be considered a 'must-see' for any film connoisseur.
Television vs. widescreen - Cinerama by Fred Waller (2.57 or 2.57:1 / 2.59 or 2.59:1 / 2.65 or 2.65:1 when cropped) - I have a whole blog post on Cinerama here. The movie 'This is Cinerama' (from 1952), 'The Wonderful World of the Brothers Grimm' (from 1962) and 'How the West Was Won' (from 1962).
The movie 'Shane' (from 1953) originally shot in Academy ratio (1.37 or 1.37:1) but cropped (to 1.66 or 1.66:1) and projected on a new 50 foot screen as opposed to the earlier 30 foot screen using Stereophonic sound. The cropping however increased film grain.
VistaVision (1.85 or 1.85:1) - the movie 'White Christmas' (from 1954), 'The Ten Commandments' (from 1956) - Alfred Hitchcock - 'To Catch a Thief' (from 1955), 'Vertigo' (from 1958) and 'North by Northwest' (from 1959).
Todd-AO by Mike Todd - 70mm film (2.20 or 2.20:1) - the movie 'Oklahoma' (from 1955), 'Around the World in 80 Days' (from 1956), 'South Pacific' (from 1958), 'The Sound of Music' (from 1965) and 'Patton' (from 1970) - Dimension 150.
Now you will hopefully better understand why movies and TV looks the way it does.