Or....we just have a great big gaping plot hole and a massive continuity error. Cos the writers at DW couldn't figure out a way to tie it in to TW without confusing the kiddies and the adults who haven't seen TW. So they didn't even try, other than having Jack dressed in approximately the right outfit, and running from a direction that TW viewers will recognise as being from the tourist office.

I don't think they'll bother to explain. *is bitter and twisted* ;)