In the liner stuff for Chaos Years, Gene says that he hated his snare sound on Alien except for on "Zen".
I don't know if I would say "hate", but I think the drum sound on Alien is the weakest part of the mix. Don't get me wrong, Gene's drum parts are phenomenal on that album but yeah, I'm not a fan of those drum samples.
Thanks for posting that video though, I saw that once I think but totally forgot about it. I'm a total whore for studio videos.