If you go to tedmosbyisajerk.com there is a site designated to trashing Ted Mosby. It includes a song "Mosby is a Jerk [Ted]" that is over 20 minutes in length. It also has a letter written to "Dear Resident" with Resident hand-written into pre-typed letter from Ted Mosby, Architect (2006).
As the episode ends, Neil Patrick Harris starts typing at his computer, the theme song from Doogie Howser, M.D. (1989) starts playing.
In the flashback section with mugshots of all Barney's possibilities of his stalker you see a picture of Madeleine Albright - which is a reference to The Yips (2007). He mentions to the "man maker" Rhonda that he "certainly didn't intend to hit that".
83% alert. Barney uses that number for all of his statistics. In this episode he mentions his eyesight is 83% gone.
The character of "Anna" and her thinking that Barney's name was Ted Mosby originated in the Season 2 episode, Ted Mosby, Architect (2006).