The Pink Floyd one was obviously done intentionally as a joke...
I think "I'm So Tired" is also intentional. I'm pretty sure the Beatles got a kick out of leaving clues to feed the whole "Paul is dead" rumor.
Stairway to Heaven I'm not sure about. Pagey certainly had the technical know-how to engineer something like that, and he is known to be a genuinely weird dude.
The rest of them are just concidence, caused by the rearrangement of syllables that occurs when speech (or singing) is reversed. Sort of like the aural equivalent of looking at a Rorschach inkblot or seeing shapes in clouds, your brain tries to impose familiar patterns on what is essentially random.
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