A manager can make a difference in these areas. It doesn't have to be by benching (or disciplining) a player who makes a bonehead play or two.
No, he's not likely to make a difference in Price's spat with the media- maybe, but not likely.
Seems like HRam got worse with running blunders, so who knows there.
Beni's blunders could be chalked up to inexperience, but lack of focus could be something a manager could work with the player on.
Notice I said "might" on everything, so I realize, this is all conjecture.