My perspective on the bathroom thing was Allen, Jay, and Harrison were in a different bathroom then the others that are in one. But that is how I saw it, could be wrong.

Also Wiki, I believe that Allen was talking to Jay when he was talking about his daughter being infected. Though if he was not being quiet, I guess Harrison could have overheard. But I don't think the statement was directed at Harrison. The last statement, about killing him, was though.