The orchestral version of "All My Loving" playing over Aunt Jessie and Buster Bloodvessel's romantic Dream Sequence
The incomprehensible soldier played by Victor Spinetti is hilarious.
Especially his one comprehensible word in an exchange with Ringo. "Why?"
"Come with me now to that secret place, where the eyes of Man have never set foot..."
The ridiculous and thoroughly incomprehensible race scene, especially since it just shows up out of nowhere with zero explanation of why it was happening. It was just so much of a Mind Screw that it wound up looping around to being quite comical.