(1) The thing with Eden is that he tends to get brutalized in every game. So, initially, in his first season, he would just simply take the punishment and not complain but he soon became aware that refs in this country don't appreciate honesty. So I've noticed myself that this season especially, he tends to over-dramatize contact (contact nonetheless) to get the attention of refs and to protect himself from injuries. I remember this season, a potentially leg breaking tackle he got from a Stoke player and all the ref did was give a yellow. You can check the video for yourself on Youtube. So, I can't really begrudge him for that. He's the most honest player I've ever seen in my life. Hands down.
Also, notice Azpilicueta and Ramires (I think) got a yellow for their first tackles, like Besic did.
(2) Thanks for that. You said it yourself. It was the unnatural movement towards the ball that really makes it a penalty. That completely changes the trajectory of the ball, so I was amazed it wasn't given, even by this season's officiating towards us.
(Sorry I couldn't multi-quote it as I wanted to. Not used to the formatting on this forum.)