It's true, in the mind palace sequence when he's trying to figure out what the words mean. Check out the images at the top of this page; if you look closely enough you can see his mouth move. And try watching it closely too.
http://sc.aithine.org/sherlock/202/22/index8.html
-----------------------------------------------------------------------------Dean
- "I'm not happy about it. But I got to move on. So I'm gonna keep doing what we do...while I still can. And I'd like you to be there with me."Sam
- "I'm your brother, Dean, if you ever need to talk about anything with anybody, you got someone right here next to you."
