The woman in the pink "Bridin' Dirty" t-shirt on the peddle pub has her hands crossed in front of her in one shot but suddenly straight out in front of her in then ext.
Santiago is wearing 2 citation bars that are not issued by the NYPD. Also, NYPD regulations require that the American Flag bar be worn as the highest citation bar - something Santiago would have known.
One of the commendation bars Officer Rick wears is a "fake" bar that is not issued by the NYPD.
Captain Holt wears his Commendation breast bar above his World Trade Center Breast Bar. When the WTC bar is worn, it is worn above all other medals, but below the American Flag bar.
When Amy is in labor Hitchcock and Scully annoy her and she tells them to leave, some viewers seem to think that instead of calling Scully by his name she calls him Joel which is the real first name of the actor who plays Scully. She actually just lets out a yell/grunt that some people erroneously believe sounds like "Joel."
Jake and Amy's "newborn" baby is obviously much older and larger than an actual newborn. State law has a minimum age for babies to be able to work on sets.
Terry teaches Holt a hip-hop dance to distract him while stuck in the elevator. In Yippie Kayak (2015), Holt was already shown to be a proficient hip-hop dancer, using his dance skills to diffuse a hostile situation with a street dancer (while Jake attempts in vain to record the happenings).