The DEO uses the call signs "Greyhound" and "Trap One" - these are the exact same call signs used by U. N. I.T in Doctor Who (1963).
This is the first time Superman has been mentioned by name, other then by his cousin. In the previous episode, he was only vaguely alluded to by various pseudonyms and descriptive adjectives. He is also called the Man Of Steel in this episode, a name of one of his comics.
Kara rescues an ambulance stuck in traffic on Donner Avenue. Richard Donner directed Superman (1978).
Superman's Fortress of Solitude is mentioned in the episode.
Both Peter facinelli and Melissa Benoist have both appeared in glee but did not share any scenes