Ted randomly had a beard due to Josh Radnor needing to grow one for the film Liberal Arts (2012)
The picture of the college that Barney flashes during his slide show is of University College, Cork, Ireland.
While Marshall's co-workers are partying, the Ewok celebration song from Star Wars: Episode 6 is playing in the background.
The third cake at the company party reads: "In case I wasn't clear with my last 2 cakes, Seriously Guys, Congratulations!"
The sign at the construction site of Ted's building says Muttnick Construction. Muttnik is one of the names on the closing logo.