Good point. But the thing is, it wasn't obvious. M/M were tiny figures, one couldn't make out it was them with the naked eye. It was also like 1/100th of a second. Blink and you missed it. I downloaded the trailer and had it play very, very slow and I still couldn't see that it was Matthew and Mary. Anyway, maybe the couple walking outside isn't important. And like ajblondie said, maybe it's Rose. What I did find encouraging was that Blake seemed jealous. Which is great because in episode 7 and 8 Gillingham seemed slightly so (i.e. "don't like him better than me"; "I don't want to leave you alone with Charles", etc). And I don't think he walks away mad (like Matthew did) and he clearly dances with her too at the same event.