An obvious bad decision that Liverpool have benefitted from this season (excluding the City match for simplicity) was van Dijk's charge in the back of Calvert-Lewin (I think), in the derby. That looked to be a clear foul, but wasn't given.
My recollection (which may be faulty) was it was inside the area (certainly close), and there was no attempt to play the ball which makes it a red card opportunity.
I agree with this, I was very very surprised nothing was given for this one. That's definitely a decision that we benefited from. I feel Robertson could easily be sent off in that game as well, if I am remembering correctly.