What was going through Hartnell's mind...
...when he saw Matt Smith?
My guess is "Crikey, what an ugly ####! I've heard of the D.T.'s but this is too much. No more drinking for me from now on.".
"Oi, who's the scarecrow in the bowtie? This is a closed set, sonny! Sod off and for God's sake grow some eyebrows."
Actually, I took it as Hartnell not so much seeing a man as the legacy that he was leaving.