Since I'm not an inveterate DW fan, though I do like the show, I doubt I even noticed it. Would you PM me with the reference if I swore never to reveal it to another until someone else does?
I moved over to the US before the last episode of the 2009 season and refuse to pay for BBC America so I can watch one or two TV shows so I haven't even seen any with the new guy. Hoping for Netflix to get more than the 2007 on instant.
Let's just say it's a reference to a Tom Baker story from the 70s, so you wouldn't notice anyway... It's not an important thing.