Melissa Rauch gave birth to her daughter Sadie on December 4, 2017, two weeks after this episode was filmed while production was on hiatus. Her lack of screen time in this episode was to give her some final rest for her real-life delivery. She came back after the winter break.
First time we see Raj's apartment over Bert's garage, after he moved from his old one in the previous season.
The first time Melissa Rauch does not appear visually and with her voice only. This makes it the first time since season 6's The Proton Resurgence (2013) (where Amy was absent) that not all main characters appear on screen.
Title reference: the consequences of the celebration of both Amy and Halley's birthdays.
This is the third time that Amy's birthday is celebrated (with coitus) in the eleventh episode of the season. It is also the second time it coincides with a Star Wars movie being in cinemas (Star Wars: Episode VII - The Force Awakens (2015) during The Opening Night Excitation (2015), Star Wars: Episode VIII - The Last Jedi (2017) during this episode).