At one point, Howard tells Sheldon to bond with his father-in-law, so that he can bond with Sheldon's. In The Thanksgiving Decoupling (2013), Sheldon did bond with Howard's father-in-law more than Howard did.
Amy's dad Larry is in awe of Howard's magic tricks, which he can't do himself. Larry is played by famous magician Teller from the duo Penn and Teller.
The first time Sheldon uses his old knocking routine in the season.
Title reference: Raj and Anu want to consummate their relationship, but it doesn't go exactly as planned.