In the end of this episode Claire and Phil go to the bedroom and the kids hear the door lock, which makes them run downstairs. The lock was given to them as a fun anniversary gift from the kids in the episode Caught in the Act (2011) after they accidentally walked in on their parents having sex.
On Phil's old answering machine his voicemail greeting "You've reached Phil's World! Party time! Excellent! Schwing!" is a reference to the 1992 film Wayne's World, in which Ed O'Neill (Jay Pritchett) has a cameo as Glen, Mikita's manager.