This may be just me, but I thought that the preview shot was from three days later indeed (or at least, some time later) but that it'd only be used as either an intro, or as a later part of the clip, and that we would get to see what happens directly after today's episode. (Sort of like in the LBDs, where Lizzie introduced ep. 98 (was it?) in a different outfit before saying 'I guess y'all want to know what happened last week' and showing us how Darcy's return went down.)
And, umm, you're right, the mistaken identity thing is cliched, but I still kinda hope they'll go that way, because I'd hate for any of the romantic reveal to be cut short - I can't help it, it's my favourite scene in my favourite book and I just hope they'll do it full justice ;-)
And, umm, you're right, the mistaken identity thing is cliched, but I still kinda hope they'll go that way, because I'd hate for any of the romantic reveal to be cut short - I can't help it, it's my favourite scene in my favourite book and I just hope they'll do it full justice ;-)