My group is mostly new to Pathfinder (including the GM), and we sometimes take "Accidental Liberties" while playing. For instance, my character has a spear with the "Brace" feature. I had been using that feature in the same round as casting a spell or firing an arrow. I just learned that the readying of a Brace is a standard action (as all ready actions are) so I shouldn't have been able to do that.
I am often studying the rules (believe it or not, I enjoy it) outside of our game session and often find instances where we might have stretched or broken the rules a little - nothing crazy that I would consider cheating. I point these little "Accidental Liberties" out just so everyone gets a chance to see how things should have worked.
I haven't found anything so drastic as to require a retcon or call anyone out, in fact it is just as often me taking the "Accidental Liberty" as anyone else.
I haven't had any negative feedback from any of our players, and we don't get into fights over what is or isn't right, but I don't want to be the annoying "rules lawyer". Furthermore, I NEVER do this in-game - at worst, I will look up a spell if I don't remember the range of damage dice or whatnot. Also, I don't point out obvious "GM fiat", only when I think we were just all assuming as opposed to understanding.
I don't think I am impeding anyone's fun, and I am certainly having a blast.
Is what I am doing ok, or should I be leaving all of the rules research to the GM, and let him decide what we can or cannot do when we are doing it?