Fake smile, his eyes are not smiling/laughing most of the time when his mouth is, when it is honest smile/laughter, eyes are squinting, you can see lines/wrinkles in the corner of the eyes, and also when it is fake smile you see both set of teeth. When smiling honestly you see only upper set of teeth, not the bottom one. Like you see him in this interview, at the very begining, and when we are mentioned, around 1 minute mark.
Noone told him that before presser. He knew it waaay before. He says "I heard.." and scratches his eyebrow at the same time. He is lying.
P.S. not body language expert (yet), just hobby of mine and read tone of the books about it.