Early versions used in CMs

[Delirium-Zer0]

Has anyone else here noticed that sometimes we hear VERY different versions of songs in the CMs they're featured in? The first time I really noticed this was when i finally heard the I am... track i was most waiting for, "still alone". I loved how it sounded in the CM, but then the album version was kind of obnoxious and i didn't like it at all. Here are all the different versions i've noticed:

ANGEL'S SONG - much simpler arrangement, very very different vocal take... may even be a demo version it's so simple
everywhere nowhere - "everywhere... nowhere..." backup vocals absent
July 1st - slowed down a bit, different vocal take
monochrome - different vocal take
Naturally - different vocal recording with a slight lyric change, quieter backup vocals, simpler arrangement
Naturally "dolly remix" - metallic effect on the vocals in the CM, gone on the CD version
STEP you - REALLY slowed down. Like ALOT.
still alone - CM has a different recording of the lead vocals, no backup vocals at all, and more pronounced guitar
too late - different vocal take (only in the first Honda cm)
Trauma - different vocal take
walking proud - different vocal take

Has anyone else noticed these? (I should add, does anyone even care? I'm a weirdo after all. heh.) ANGEL'S SONG, Naturally, still alone, and everywhere nowhere are all especially noticeable. Was anyone else disappointed with the final versions of one of those songs? Or did anyone hear the CM version, not like it much, then love the full album version?