What are the sources of the covers they've done?
Other covers performed by MM include the Stooges' Dirt, and Jim Carroll's People Who Died, but these have only been played live, not recorded. There's a persistent rumor that they've also covered Tool's Opiate, but that's never been verified and is in some doubt.
In addition - appropriately, given the connection between the original Manson Family and the Beatles - they've often used short sequences from Beatles songs as bridges between live numbers. Favorites are Come Together (also appears with one of the cassette versions of My Monkey) and Strawberry Fields Forever. They've also performed Helter Skelter in its entirety.