Why the poor quality of the color movies?
Most, if not all, of Hitchcock's color movies have been remastered, but the images in the documentary seem to be ancient copies. For example, I just watched "The Birds" on DVD last weekend, and the color was much more lustrous than the images in this documentary.
Having said that, I was happy to see excerpts from the movies on the big screen.
As Wes Anderson said, my copy of the book "Hitchcock/Truffault" is falling apart, too, and I was happy to see a documentary highlighting two of the greatest directors of all time.