John Carradine (Casy) looks like Screech

I just watched this movie for the 3rd time, and all of a sudden I was amazed how much Casy looked and acted like Dustin Diamond (Screech from Saved by the Bell). I couldn't wait to get on IMDB to check the relation because I could've sworn that he was his Grandfather or something.

On the other hand I saw the name "John Carradine" in the opening credits and of course I assumed that he was related to the late David Carradine. But in the movie, once they started traveling and stop at their first camp--Connie plays guitar, and the stranger gives them the first hint that the hand bills are bogus--there was one guy in that scene who had maybe one or two lines. I thought he looked JUST like David Carradine, so naturally I picked him out as John.

IMDB of course has cleared this up for me, but I feel so dissatisfied because I really felt like I was on to something.

Can anyone else at least see where I'm coming from?