If someone forgets Jump Up or Tackle, well, whatever, it's in their disadvantage, so I don't see a problem.
If someone keeps 'forgetting' things like Frenzy, Bonehead, Wild Animal, etc. they deserve a warning, and after that some serious bitchslapping
But keep in mind that you are the league commisioner, not the league babysitter. The two players involved in the match should take the responsibility first, and only if they aren't having any fun, or if you get complaints should you step in. IMHO ofcourse....