Definitely worth a side trip if you’re a fan. To get to the graves used in the movie, turn left immediately after the little chapel building and they will be on your right after you pass the first intersection.
The cemetery itself is rather small and stark. His grave is really easy to find though and usually decorated with soup cans.
Exactly what you would expect. Someone even dressed him for Christmas. It’s right in the middle of town, though, so I wouldn’t bother going if you’d chicken out due to embarrassment.
If you like kitsch and are in the area, definitely stop. The grounds present plenty of silly photo ops.