Alright, BillytheCat, and any others with knowledge, here's one that I think changed in recent years and I still don't comprehend.
How come the clock doesn't always stop when you run out of bounds? Used to be the clock would always stop after a player goes out of bounds. Doesn't seem to be the case the last few years. Only in certain situations. Am I wrong? Or has the rule changed? If so, what are the changes?
Depends, is there forward progress or did the runner simply go OB. If hit and knocked sideways then the official will be winding the clock signifying he has forward progress spot. If the runner steps out on his own, or knocked forward out, you would have a stoppage.
HOWEVER with the new timing rules a few years ago, going OB does not really matter as the clock is only stopped until the ball is thrown back to the hash marks.
Note, under 2:00 in each half you have traditional timing rules.