When Barney faked his heart attack he called out to Elisabeth. This is a reference to "Sanford and Son". Fred Sanford would clutch his chest and yell "I'm coming Elisabeth" when he pretended to have an attack. [Moderator: This should probably be under references but there was only a link to add movie references. This is a reference to a TV series]
Maury Povich can be seen in the background or is interacted by each of the gang members while running to the steak house.
While on the bus, Ted points out the Alberta Building to the man sitting next to him. This is the same building Ted identified as his favorite building in the city, and where the gang crashed the party of Jefferson Van Smoot in Robots vs. Wrestlers (2010).
"Marshall Versus the Machines", the folk song for Marshall's run, is sung by Jason Segel, the actor who plays Marshall.
When Ted shows the gang directions to the steakhouse, the bar's address is 150 W 85th St. This is now 'Mannes College The New School for Music'