Three years ago I was doing Godzilla's theme by ear.
At 0:23 the strings hit a C note 6 times. I could have sworn it was supposed to be 5, but I listened to the source material and it was indeed 6. A little later the same thing is done with a D note: could've sworn it should be 5, it was actually 6. Naturally, I concluded that this was the result of me entering a parallel universe where Akira Ifukube had composed the song with a different tempo... no wait, I actually realized I had just never listened that closely to the song and was simply mistaken.