Princess Carolyn has a phone conversation where she asks McG if he's still looking to fill a role in his Teddy Roosevelt transgender reboot of Planes, Trains & Automobiles (1987) called "Plans, Trans, a Man, a Canal, Panama." This joke includes a reference to "a man, a plan, a canal, Panama" which is about Roosevelt's mission to build the Panama Canal and is often claimed to be the longest English language palindrome.
At the end of the phone conversation with McG, Princess Carolyn walks past a campaign poster that reads, "Yes, We Might!" a reference to the Obama campaign slogan, "Yes, We Can!"
Woodchuck Coodchuck-Berkowitz, played by Andre Braugher, has a wife named Madeline. Braugher also stars in Brooklyn Nine-Nine (2013), where his ex-girlfriend/nemesis is named Madeline.