Instant Replay and penalties

[Morningrise]

Instant replay can be used in the NFL to verify numbering of offensive linemen, including in scrimmage kick formations (for which, I believe, teams give the officials a list of their numbering exceptions before the game). There has been at least one instance where no flag was thrown on the play but a penalty was assessed after review.

I believe, but am not sure, that touching and batting of loose balls are also reviewable, which presumably means penalties could be reversed or even created on review.