Something to do with a monkey on his back? Except it's not on his back! ("I've got a monkey on my back" = "I'm addicted".) I must say this interpretation never occurred to me and I think it's very unlikely that it was intended by either Blue Note or McLean.
ah, I see... I think the reference I picked up somewhere, might have been in the Penguin guide (they thought it was ironic or something, that the monkey on the cover sort of un-disguised McLean's habit, but I'm sure what it exactly said).
The monkey's name was "Mr. Jones" The monkey is decidedly off of Jackie's back
'nuff said
Hmmmm, guess I'm still curious where this monkey came from. Was it McLean's pet or something? Were monkeys allowed as pets in NYC? Just wonderin'