^Yeah, it was never explained how Harley found the house, as far as I recall.
Also, one thing that bugged me was that the wounded zombie who was dragging himself along the street in that scene with the screaming women (which never had any payoff, so it's odd that the scene was even there) looked to be the same guy who was standing right in front of Harley when he set off the explosives. If all the others in the house were blown to bits, how come the guy right next to the bomb was still half-intact?
Also, one thing that bugged me was that the wounded zombie who was dragging himself along the street in that scene with the screaming women (which never had any payoff, so it's odd that the scene was even there) looked to be the same guy who was standing right in front of Harley when he set off the explosives. If all the others in the house were blown to bits, how come the guy right next to the bomb was still half-intact?