The explanation of the name Gazebo made by Ted to his students is completely made up.
The actor who plays "Blauman", the character who introduces Jenkins to Marshal by saying, "watch out for this guy, he steals stuff" is Taran Killam, the real life spouse of Cobie Smulders who plays Robin.
During a lecture to his architecture class, Ted explains "...he is only remembered for one thing, that my friends is the sad legacy of Gregorio Franchetti Gazebo," as he shows a slide of a gentleman (circa 1900) in front of a gazebo. Gregorio Franchetti is a friend of Josh Radnor who plays Ted, and is credited as Assistant to Director in the film Happythankyoumoreplease (2010) which was directed by Josh Radnor.
The college bar that Robin, Ted, Barney, and Marshall attend is the same set that was used for The Scorpion and the Toad bar and the Minnesota Vikings bar.