"Why two swords? Does he lose one often?"

I think that was a repeat from one of the other games. Also, something from one of the children along the lines of "I'm going to be a priestess so I don't have to marry a yucky boy"

Lambert making fun of the game's trailer....
LAMBERT: "Vesemir told me about that job you did for those Nilfgaardians in Velen". [high pitched panicked voice] "What...what are you doing?" [Geralt's low growly voice] "Killing monsters" .... "Haha, good one."
GERALT: It just came out that way.

Pretty much everything Lambert says during the drinking scene.

I really do enjoy making the wrong conversational choices and then have to kill characters that I really like, or invested some time in!

I swear some kid or another sang the same tune -- and in the same way --, as the Willow companion known from Fallout: New Vegas.

"If I ever have a son, I'll name him Geralt."

Really? X^D missed that one.

The seven dwarves.

Could you please tell me which contract/quest is that? I tried searching for this one but to no avail.

Wind....

No specific quest - just any one that you do for a village that saves them - like "The tower outta nowhere". If the townsfolk are indebted to you, you will hear this comment as you walk through.

When you liberate an area, sometimes you hear it, or in a village where there's a notice board and you did more than one contract from it. Usually it's just a peasant or villager who says it when you're walking around.

Happens after you liberate many of the towns that need clearing. Usually a male npc will say it.
PFFFFTTTTT! Can you do that???

Yes and play plenty of tunes,everyone can.

Have you not been to the farting Trolls, yet? Make sure you stand still before entering to hear their conversation...

Yes, all the Trolls are funny - too many rotten onions!!!!!!!

I love the Troll at White Eagle Fort best and his singing!!!!!!

"Who drinks barrels and asks for more, we are the men of Tretogoar"

Triss trying her doe-eyes trick ... ^_^