The line shouldn't be vertical but the same as the goalbox linea angle. From that Lovren should be offside.
But fuck these miniscule differences. I'm from the old school thought that the offside advantage should go to the attacking team. But how do you judge the buffer zone I guess.
It's weird though that the whole ball cirviture of the ball must be passed the line to be off the field, but the FRONT of the body must be a mm ahead to be offside.
With the difference of directions between defence and offense it should be the back.
I was fairly sure they were supposed to be making the lines thicker and think they did in the premier league. Not thick enough though