Pinky and the Brain

The fast postman stamping "fragile" on packages strongly resembles Newman from "Seinfeld".

"All You Need Is Lunch" is obviously a play on the Beatles song: "All You Need Is Love", but it may be also be a subtle tribute to Eric Idle's Beatles parody: The Rutles, who sang "Can't Buy Me Lunch".

Maxwell's Silver Hammer At the beginning of "All You Need Is Narf," a silver hammer is seen in the background labeled "Dr. Maxwell." This is a reference to the Beatles' song "Maxwell's Silver Hammer."

The Beach Boys Also visible in one guru scene is an animated version of the Beach Boys, who themselves were also devotees of Maharishi Mahesh Yogi.

6-month sing in for peace and dental hygiene A parody of John Lennon and Yoko Ono's week long bed-ins for peace

Mouse-arishi Maharishi Mahesh Yogi was a spiritual guru that the Beatles associated with and sought enlightenment from in India.

Walter Concrete This character is a parody of Walter Cronkite- a famous news anchor of this era.

All You Eat is Lunch A parody of the song, "All You Need is Love", which is also alluded to by the title of this episode.

Narf Out! A reference to the phrase Freak Out! popularized by Frank Zappa's 1966 album of the same name. (the episode is said to occur in 1967)

'What We Are Singing Is Take Off Your Pants' A parody of the Beatles' song, 'Give Peace a Chance'.

I Am The Cheesebag- Boo Boo Badoob This song is very obviously a parody of the Beatles' song, 'I Am the Walrus', which contains the phrase 'Goo Goo Gajoob.'

Jim Lemon falls in love with Yoyo Nono and the Feebles break up: The romance of John Lennon and Yoko Ono was often 'blamed' for the break up of the Beatles.

The members of the Feebles (BEATLES) are as follows: Jim = John Fred = Paul Steve = George Bongo = Ringo