Anyone notice in the ending credits when the 3 are running around bouncing the basketball, that Dwayne steps on the grass and nearly slips. Its not in every ending credit, just the extended ones. Sort of like Welcome Back Kotter extended ending, when they show the unicycle guy completely disappear around the corner.

Of course, I had to go and look and you're right. But most episodes don't play that far into the ending. Plus, he caught himself.