Bit late to this party, but the OutRun prototype screenshot was particularly interesting to me. It looks like it's from an unreleased version of the game.
- Timer is using the font from Space Harrier. This font is in the OutRun ROMs but not used anywhere. Now we know it was used in an earlier prototype version.
- Sign art is different in a number of places from release.
- Debug information above speed on left hand side.
- No rev counter
- kp/h graphic is different
- no route map