Horse (in place of John Lennon), Muddy Mudskipper (in place of Ringo Starr), Stimpy (in place of Paul McCartney), and Ren (in place of George Harrison) walking across the street.
The Beatles' members are being replaced by animal stand-ins: Horse takes John's place, Muddy Mudskipper steps in for Ringo, Stimpy fills Paul's spot, and Ren replaces George.