Posting of Rules

During a recent trip a dealer allowed me to split 8's 4 times, then a few hours later at the same place the dealer would not allow me to split more than 3 times. Since this isnt a rule that generally is spelled out on the table, do casinos need to post house rules somewhere per gaming control regulations?

no.

The common rule allows splitting to up to four hands. A new dealer, in particular, could easily get confused and think this meant that a player could split up to four times.

Every state has different rules. They are usually online if you want to research it.

Blackjack rules

Here's a link to the NV rules page: http://gaming.nv.gov/stats_regs.htm (Archive copy).
A while back, I was not allowed to double after split at a downtown store. I called gaming (if you play a lot in NV, it's good to have the number programmed into you phone), and was told that's not a rule, like payoffs (3:2, 6:5, etc.) that has to be displayed. It does have be in a book in the pit, I was told.