He sings the highest note as falsetto I think the chorus and the end of SYCMIOYO and probably the highest note with is normal voice is the Feeeel parts in Vertigo
He's pushing really high in the bridge of ABOY too. The last note of the bridge is waaaay up there, would have been even in the 80's. And yeah, the "sing" note in Sometimes is very high, but the impressive part of that is the power he hits it with.