 Various references to The Beatles. Among them, Green Apple, Will  Ferrell crosses the street ala the Abbey Road album cover, hes a  Taxman, Karen Eiffel is a writer (paperback writer) and her  assistant is named Penny, Everyone is running for cover, i.e. "When  the Rain comes the run and hide their heads they might as well be  dead," except Karen. Also, when Harold goes to the phone in the  plaza the old guy using it is telling the operator that his  daughters name is Mrs Epstein, as in, Brian Epstein. The guitar  Harold gets is exactly like one John Lennon used.