When Captain Holt promises Rosa that he wouldn't talk about Kevin anymore, he clearly has his fingers crossed.
When Rosa and Holt sneak into Kevin's house to delete the email, Holt is wearing dark colored sneakers. It was stated in Captain Kim (2020) that Holt only wears sneakers for their intended purpose: sneaking.
Aired on Melissa Fumero's 39th birthday and the day after Andy Samberg's 43rd birthday.
After Jake agrees to take Mac and Terry, Charles and Amy leave, Charles is visible through the windows of the room waving at the camera.
When Jake and Amy are arguing about taking Mac it is obvious that the baby in the stroller is a doll and not an actual baby.