When Higgins makes his toast at the end of dinner, the cities he lists are the actual hometowns of the actors.
Roy, Keeley, and Phoebe spend an afternoon knocking on doors just as Hugh Grant did in "Love Actually."
The "HI TED" writing on the pavement mirrors the "HI BOSS" from The Diamond Dogs (2020) in season 1.
The first episode to feature a different style themed opening credits, involving holiday colors along with the claymation of each character in front of their names.
The cat photo at Higgins' house is of Cindy Clawford, Higgins family cat repeatedly mentioned and passed away on season 1.