The title "Guardian Angels" is also the name of a citizens' safety patrol and crimefighting organization, originally founded in New York City in the 1970s and expanded over the years into several other US cities and to other countries. It is the real-life counterpart to the fictional "Urban Defenders Safety Patrol" featured prominently in this episode.
The "Urban Defenders" patch on the jacket and ball cap of the founder Christian Ward appears to be a cropped version of the "Scarlet Knight" mascot of Rutgers University in New Brunswick, New Jersey.