Yes, I like your idea that the Doctor's little pep talk at the end might tip Nixon into full-blown paranoia - and the best part is the Doctor's not even doing it on purpose! :D "Oh, Tricky Dick, they'll never forget you..."

I spprove of the Russian too sentiment, but I think my fanon now is that Canton's significant other is the black Secret Service guy we were talking about last week. No idea how they've managed to keep it under the radar, but still... :)