I agree the refereeing was abysmal, particularly the Slater obstruction.
It should have been a penalty try and 10 in the bin. The bin is used for professional fouls, penalty tries are awarded when a player deliberately fouls out an opponent to prevent a try being scored. I dunno how much more blatant Slater could have been short of informing the ref of his intent before plowing into the pursuing NZ player.
Glad we won, but honestly at that point I turned the TV off and went to find something else to do. Slater and his bloody brain explosions...