The scene where the manager hides in the bathroom and is subsequently crushed by the smiley-face sign is a parody of Jurassic Park where the Tyrannosaurus eats the lawyer hiding in the bathroom.
The scene with Quagmire seeing a beautiful woman from the back and then turning into a fat woman from the front is similar to the film Shallow Hal.
When Joe sends the last ping-pong ball out the window, Peter says he will get some more from Mr. Moose, a reference to the character from Captain Kangaroo who, as a regular joke, has ping-pong balls dropped on the Captain.
The Easter-egg hunt scene with Richard Gere refers to an old rumor about him going into an ER to get a gerbil removed from his rectum.
While protesting outside the Superstore USA, Peter raises his fist and erroneously chants “Gattaca!”, the 1997 film of the same name instead of “Attica!,” from the film Dog Day Afternoon about the prison protest.
Peter saying “When I walk into Superstore USA, I get the sensation...THAT I’M STANDING ON A MOUNTAIN TOP WITH THE WIND BLOWING THROUGH MY HAIR!” is a take-off of the “When I bite into a York Peppermint Patty, I get the sensation” commercials.
When Diane Simmons reads an on-air message from the Quahog electric company, she screams “Hey, you guyyyyys!!” a la Rita Moreno from The Electric Company, which is then followed by an animated version of the opening sequence from the show’s first season.
“Superstore USA” is a reference to Wal-Mart and other similar retailers.