This is the first time that the Smith's stovetop uses gas, whereas all other times the surface was flat to indicate electric burners.
When we first see Snot dressed in his tuxedo, he is not wearing socks. When he is in the limo struggling with his pants, he is now wearing tube socks.
When Stan learns that Honey was born on the 30th, he claims she has the same birthday as Selena Gomez. However, Selena Gomez was born on the 22nd.