Michael Heilemann made a visually annotated version of Star Wars—and a much-deeper text commentary—attaching footage from other films and series that he believes influenced George Lucas' space opera. Some of them are well documented, some may surprise you, yet others feel too much like wishful thinking.
While some of the visual references are interesting, they seem more like an exercise of reverse engineering and guesswork than an actual catalogue of documented connections between the alleged sources of inspiration and the final film.
It feels incomplete because it's missing a lot from The Hidden Fortress (see below for Heilemann's comments.) Kurosawa's film and Flash Gordon are, according to Lucas himself, the two main visual and thematic references in Star Wars. And while Flash Gordon didn't have much visual influence—it just set the underlying tone of Star Wars—many scenes from The Hidden Fortress' were remade by Lucas, as documented by this side to side comparison.
Here's another look a the film, focused on the confirmed sources—Star Wars Influences: Behind the Force.