I was watching the un-aired pilot for Lost in Space last night and I was struck by how the design of the thing and the superb (for their day) production values reminded me of some of the design drawings for the first two films. It also reminded me of some the Archie Goodwin strips.

The show in general may have had some sort of influence maybe after the first film had been shot.

Jonathan Harris and Anthony Daniels do sound similar which might have influenced Lucas to drop the oily car salesman voice he was going to dub over the footage and it's not that huge a leap from a chimp with big ears to Yoda.