The Beatles were a British rock/pop group that were its popularity in the U.S. from 1963 to 1970.
The references are:
The earliest Beatles reference can be found in the episode "Arthur's Spelling Trubble." When Arthur is reading his dictionary, one of the entries is called "Abbey Road."
"Arthur, It's Only Rock and Roll": The scene where U Stink are chased by preschoolers has music that begins with the opening chord of the song "A Hard Day's Night" and continues in the style of the song. There was a similar chase scene in the movie "A Hard Day's Night". Also, in "Manager of My Dreams," the Backstreet Boys are wearing uniforms resembling those worn by the Beatles during the Sgt. Pepper's Lonely Hearts Club Band era.
"The Secret Origin of Supernova,": A model of a yellow submarine is seen on a shelf in Freddie K's store. This could be referencing the song (and movie) "Yellow Submarine." A yellow submarine is also seen on a poster in the Sugar Bowl in several episodes, including "Sue Ellen Chickens Out".
The Agent Of Change: Binky mentions a character from the movie "Trucks" named "Rita the Meter Maid." This is likely a reference to the song "Lovely Rita," a song off of the album called Sgt. Pepper's Lonely Hearts Club Band.
"Muffy and the Big Bad Blog": The name of Francine's and Muffy's advice column is called "She Said, She Said." This is the title of a song from the album Revolver.
"In My Africa": Brain, Cheikh and D.W. walk across a zebra crossing looking like the Abbey Road cover. Brain's cousin Cheikh is possibly a reference to the character of the same name in the Beatles' film "A Hard Day's Night."
