deer was shot went through the deer and into the kid.
the only thing that doesn't make sense is them hiding under the cars lack of smell thing. But like any show you can't read too much into shit like that or EVERYTHING will annoy you.
sit back, relax, and enjoy a zombie show.
edit: in the post show talk show the producer/guy who made the comic said that the "zombies" are not bloodhounds. If you are right next to them they might be able to smell you, but if you are under a car where there is going to be dirt/oil bla bla bla and they are walking by, they will not be able to smell you. Especially since i'm sure they haven't showered in days.
Either way i'll stand by my comment that nit picking too much is a sure fire way to ruin a good time.