I thought Lamela was offside, by a toe. In that situation an error by the linesman is completely understandable and forgivable.
In the first goal, under the laws of the game, Kane wasn't interfering with play, even if he caused Lovren to play at the ball. The right decision was made under the rules, but I think the rules need looking at. I don't think there's any doubt Lovren deliberately played the ball.
In both challenges the contact made was completely worthy of a pen.
The linesman DID NOT fist pump. That's insane. Even if he was biased (which no ref in the BPL is), why would he be dumb enough to demonstrate that in front of tens of thousands of people. Don't be ridiculous.