Reptiles Eat With The Bones We Hear With - Refers to the bones in the jaws of early reptiles, which, by the process of evolution, shifted to become the stapes, malleus, and incus (sometimes called the "stirrup", "hammer", and "anvil", respectively) in the middle ears of mammals
It Never Fails - "We're cops, we're not psychiatrists; We ain't no Sigmund Freud"
It Was A Very Good Year - "In a state of quantum uncertainty / We would have sexual intercourse / While at the same time we would not have sexual intercourse" is a reference to Schrödinger's cat