The originally pressed record had a dog whistle recorded on this song, too high a pitch for a human to register. But when early adopters/dog owners played this album, dogs went ballistic https://www.youtube.com/watch?v=P-Q9D4dcYng
This one is my favorite Beatles song and I don't think I've seen it posted yet. https://www.youtube.com/watch?v=C3xdeatlwYk