What do you do about contradictory rules of Pit?
The rules in my copy of the game note that two people get 10 cards. Generally these will be the two people left of the dealer.

You cannot call pit with the Bear in hand; you can call Pit with a Bull and 8 copies of a commodity. If you call Pit with a Bull and all 9 copies you get double points for that commodity.

Of note, it is courteous to remind people that they have 10 cards in hand but only need 9 of a commodity. New players often end up holding all 9 of a commodity while desperately looking for a phantom 10th because they are used to seeing their entire hand match.