[the year 2024:]
Ted: So, what happens next? With Lily and the wedding dress, I mean.
The Mother: Well, she brought the dress so she and Marshall could get new wedding photos taken, because, in yet another story I know...
[flashback to Marshall shaving his head on his wedding day]
The Mother: What space would I have in my brain for other things if I didn't know all this? Ah, probably just state birds or some crap. Heh.