My problem isn't players being rules lawyers, or arguing over rulings, but one player who just can't seem to read the books completely, and misremembers rules (in his favour, of course).
For instance, trying to get a double move while using expertise. This seemed strange to me (I was the DM), so I asked him if expertise didn't require a melee action. He said no and specifically said it made no mention in the PHB of such.
On a suspicion (I have known him for 16 years) I opened my PHB to the Expertise feat and read:
Benefit: When you use the attack action or full attack action in melee,...
So it wouldn't help having him read the rules, or sit with the book open at the apropriate page, I have to dig out my own book and read it.
It wouldn't be so bad if it was just an isolated incident. At the same time, I know him so well, that I know it isn't on purpose either, he just misses certain facts, and you have to pull out the PHB and point to the page before he'll admit he misread/misunderstood/hadn't read that part. Anyway, he is a good friend, just selectively blind... Thank god its only game!
But all told, even with the above, we spend less than 10 minutes looking up rules each session, and it is getting better. Alot comes down to the time I get to prepare, really. If I have prepared well, I have made notes of all the wierd stuff I might throw at them (nets, grappling, swallowing, swimming while playing the banjo...)