One particularly wacky situation is:
e.g. ...
Blinds 5/10
Player A (BUTTON) goes all in for 500.
Player B (SB) has the option to raise to 510 instead of 990 like it should be?
This only applies to all-in situations.
Try it in play money if you don't believe me.
e.g. ...
the min bet doubling on the turn in NL poker ?!?
e.g. ...
minimum raises preflop (HU only?) being 1/2 a big blind (edit, this one doesn't happen all the time)
etc, etc, etc