September 28th excerpt:

For a moment while Dean talked, Nate nearly froze halfway through his descent down the stairs. This was the most Dean had spoken around him, only a few sentences but enough for Nathan to notice something important.

Dean was American.

December 12th excerpt: 

Letting go of that finger, Dean moved over to Lestrade’s middle finger, deciding he would simply continue until he found one that he was taller in comparison to. He couldn’t be shorter than all of them…

Right?

Lifting up this finger just like the first, he looked at Sherlock with slightly unfocused eyes. “How ‘bout now?” he asked, his accent thickened with a distinct slur.

Sherlock rolled his eyes dramatically. “That one’s longer than the last.”