The best way to fix this problem is have the umpire tell the official upstairs why he is giving it not out. So if a situation like these two arises he can use that information.
For example, I believe it was hitting in line but I think he may have hit the ball with the Trott decision. Then they have the umpires call in two different areas and a problem like this wouldn't exist and nobody could argue the point.
I think this is right, and perhaps this is even what happened last night. Maybe while looking at the decision, Dar told Erasmus that he thought Trott had missed the ball and he was worried about the line. In that case, the umpires call was clearly wrong and the decision then deserved to be overturned. Watching the Lions-Wallabies rugby the other week I enjoyed how you could hear the communication between the on field umpire and the video umpire. If that happened in cricket, maybe we see less confusion around the DRS decisions ie. they could be properly explained by the 3rd umpire. Simon Taufel would be perfect for this. He got some commentary experience in IPL,and knows the rules backwards. Get him in the 3rd umpires chair as much as possible, and have him talk through the decision. Because the TV commentators are largely clueless.
England did get a bit of bad luck last night, but I thought that both the Agar stumping and the Trott LBW were not OBVIOUSLY wrong. Probably wrong, I'd say, but I certainly wouldn't have bet my house on either of Erasmus' decisions being incorrect. I can understand that he didn't have enough evidence to give Agar out.
For Trott, that front on angle can be deceptive. It looked like there might have been a small deviation, but you have to weigh that up that fairly shaky conclusion against a very strong case for the Aussies: ball smashing middle, no hotspot from front on and the sound didn't suggest an inside edge either (probably because if Trott hit the ball it would have been so late that the sound of nick and the sound of ball hitting pad would have been instantaneous - Snicko later showed this). England can also claim at least some good luck during the match eg. Dharmasena gave Rogers out LBW for one that was just clipping, while Starc has had 2 LBWs struck down that were hitting more of the stump than Rogers' ball - just not enough of the stump...
But on to cricket...Agar was fantastic. Has to be at #8 next innings. Then we'll all get to complain how Pattinson doesn't deserve to be at #11
Aussies were very accurate with the ball, most sustained bowling I've seen from them for a while. When I looked at the scorecard this morning and saw 2/80 I groaned a bit, not expecting much. But watching the tape it was really disciplined stuff from Australia. Not many 4 balls like in the first innings.
On the other side of the coin, KP and Cook played well too, nothing stupid. Cook you expect it, but Pietersen was pretty smart, playing straight instead of through midwicket. It was a slow moving stalemate that both sides could be proud of.
Getting that ball moving again this morning will be key. Glad Watson's calf tickle wasn't serious, because he's good with reverse and I'd like to see him bowl 5-10 overs before that new ball comes.