The actor who portrayed Olympic fraud Tyler Brody on 30 Rock is the son of the actor who portrayed Dee's high school drama teacher Dr. Meyers on It's Always Sunny in Philadelphia [detail] [crossover]
Another connection (that is admittedly a bit of a stretch) is that this 30 Rock episode had been removed from syndication, streaming, etc. due to its satirical use of blackface, and this Always Sunny episode was part one of a two-part episode where part two was removed for the same reason.