When I watched "Monkees Get Out More Dirt" this morning, I noticed some literary allusions (which aren't pointed out in the DVD trivia).
At the end, after April announces her engagement to Freddy Fox III, Davy says, "April is the cruelest month." This is the first line of T.S. Eliot's "The Waste Land." Then Mike says, "Well, I guess it just goes to prove what Shakespeare said: 'To thine own self be true, and it must follow, as the night the-" at which point he's interrupted by Micky. Specifically, this is from Shakespeare's Hamlet. Polonius says to Laertes "This above all: to thine own self be true, / And it must follow, as the night the day, / Thou canst not then be false to any man" (I.iii.82-84).