Pesachim 98: Tying Up Loose Ends

3 interesting mishnayot: 1. Designating an animal that never should have been consecrated for a Korban Pesach - what can be done with the animal? What if something gets in the way of the offering between the time of consecration and the time of offering? What if one becomes an onen - an immediate mourner? 5 Amoraim then address what the case is, of when one became an onen. 2. Animals that are mixed up, between which was for which korban. Now what?! Some measure of penalty seems in place, presumably for the fact that this was allowed to happen. 3. After a Korban Pesach has been designated, it gets lost, and all the parameters of one person going off to find it, while everyone else has designated another animal in the meantime, and all the possibilities thereof. Plus the cases of multiple confusions.