Here's my take in the two controversial TMO calls in this match. I'll deal with the easy one first
The no-try forward pass
This was the correct call. The ball was so obviously thrown forward out of the passer's hands, that I have trouble understanding what all the *****ing is about. The passer's hands went forward and the ball went directly forward from his hands. This was about as clear and obvious as a forward pass can get.
The no-knock on try
This one is a bit harder to judge, but IMO, the TMO made the right call, This doesn't mean that ball was not knocked on, only that it is too difficult to tell. The Law says...
[textarea]A knock-on occurs when a player loses possession of the ball and it goes forward, or when a player hits the ball forward with the hand or arm, or when the ball hits the hand or arm and goes forward, and the ball touches the ground or another player before the original player can catch it.[/textarea]
... and the clear implication here is that once the player's hand touches the ball, there must be separation between that player's hand/arm and the ball, and then ball next touches the ground (or another player) before it can be ruled a knock on. At no point in the video replay sequence is there a frame or frames that clearly show separation between Savea's hand and the ball, and in the absence of that, the TMO has to rule play on.
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As a referee, you can only rule on what you actually see; you cannot rule on what you don't see or think you see!