Incorrectly regarded as a mistake: Ed is recording the old man carve a stick his film camera shows a black & white image. While the film he's using may be black & white there's no reason it would remove color from his viewfinder.
This, is a common effect showing the audience the distinction between what the audience is watching as a part of the episode and what is being captured on Ed's film.
This, is a common effect showing the audience the distinction between what the audience is watching as a part of the episode and what is being captured on Ed's film.