Listening to U2's The Joshua Tree on CD back in high school, I frequently noticed that the song Exit started with a short section that sounded more like the preceding song, One Tree Hill, than like Exit.
I noticed today that this is called out in the Wikipedia page for The Joshua Tree:
In 1996, Mobile Fidelity Sound Lab remastered the album and released it as a special gold CD. This edition rectified the incorrect track splitting between "One Tree Hill" and "Exit" that affected some CD releases; the quiet coda that concludes "One Tree Hill" had previously been included in the same track as "Exit".
How does this kind of mistake happen?