No narration from old Ted.
The wedding book that Lily makes for Robin plays an instrumental version of "Sandcastles in the Sand" when Robin opens it.
It is revealed what was Ted's embarrassing story about a thermos that Barney used to blackmail Ted in S6E18, when Robin says while watching the wedding bride 2: I wanna see if Jed can get his wiener unstuck from that thermos.
The joke from the wedding bride 2 where 'Narshall' has chocolate cake covered on his face is a reference to This Is The End (2013) where Jason Segel tells Kevin Hart this story.
The hockey jerseys worn Robin and her sister are Atlanta Thrashers jerseys without the logo likely to avoid being sued for copyright infringement.