Max claims his painting was compared to Michelangelo, then asks "Would you believe Charlton Heston?" in a reference to that year's epic film in which Heston played Michelangelo.
After the Monkees finish scribbling all over the mansion's floor plan to the point where it resembles a work of modern art, Micky remarks, "It's no Michelangelo" to which Mike responds, "It's no Charlton Heston either".