Continuity mistake: When the Carlton son reaches in to pull the plug out of the sink you can see the plug chain on the cutting board to the left of the sink before he even reaches in, then he pulls it out and puts the plug chain on the board. (00:14:30)
Continuity mistake: Dean circles the newspaper article on Sophia Carlton. When he hands it to Sam the circle is different. (00:03:20)
Answer: Over the next few episodes, it is revealed that something is not quite right with Sam - that his soul is missing since he returned from Hell, and he does not feel any emotion or attachment to his brother.
Sierra1 ★