Junk left over from Lion - can I delete it?

Having reverted from Lion 10.7 to SL 10.6.8, I find some folders that I think are Lion specific (I know, I did it the wrong way; I should have wiped the disc before cloning back...but its too late now as I already updated a load of stuff, then re-cloned my source to update it before I noticed this stuff).
Can anyone tell me which of these I can safely delete? I'm assuming I definitely don't need DocumentRevisions-P100, not sure about the Spotlight-P100. I s that Lion specific Spotlight file? I don't think 10.6.8 supports mobilebackups either, and have not idea what .hotfiles.btree is.
Any help much appreciated.

You are seeing a number of files/folders, the dimmed ones, that normally should be invisible. You DO NOT want to delete them. I'm seeing mostly 10.6 ones; there may be one or two that are Lion specific. I don't know Lion, but if they aren't doing any harm, just make them all invisible and forget about them.
Open the terminal and type or copy/paste:
To make visible.
defaults write com.apple.finder AppleShowAllFiles -bool true
Reverting to the default of NOT showing hidden files ( use this one):
defaults write com.apple.finder AppleShowAllFiles -bool false
Restart or Force Quit Finder required to take effect.
killall Finder

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