Winston jokes about being named "Theodore K. Mullins". Theodore 'Ted' Mullins is the name of a character in the TV show Schitt's Creek.
Early on in the episode when Jess dismisses her class for lunch, one of the students leaving the classroom looks directly at the camera twice.
When Cece is in her car on the phone to Schmitt, you can clearly see the Home Screen lit up on her display. The version of iOS didn't allow that when this was made, it would've shown the Call screen.