It's not technical, but...

Fred Haise didn't sneak a copy of "Spirit in the Sky" on board, then play it during their broadcast. "Also sprach Zarathustra," the theme to 2001, was what was actually played. Tom Hanks makes a reference to this. It seems like a fairly transparent ploy to pad the soundtrack (which is one of only 20 cds I own) with "era" music.

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