Tobes, you're right it didn't affect the result, but watch again. As Carra said, hes on his way down before he even gets to Trent. Ih he had headed the ball then ran into a prone defender trying to get to the rebound off the bar I don't think the ref would even have thought about it.
But as said, you deserved the win and the pen was the cherry on top of the icing. I'm sure that, and the non sending off of Pitchford and the Mane offside that wasn't earlier in the season will all be forgotten when Liverpool next get a decision- they always do in derby folklore.
But I'll go now as I'm sounding like my bitter uncle and my first hangover since Christmas is crucifying me.