sorry to answer just now.
Karl did say in interviews that he sometimes is so much in trance through the music and his dancing that he forgets his lines, or cues or what song is playing... Rick is always there to rescue of course. If you've seen them a couple of times live on stage, you'll see these little things happen, cues given, singing in closed mikes etc.. That is what it makes it a live preformance...
And due to these 'alterations' to the album versions could be called remixes by purists
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http://kwiebusch.blogspot.com Underworld fan weblog
Karl: adrenaline is my drug of choice, the kick-drum is my dealer (Osaka 2005 gig)
Underworld Socks!!! - Danielle Short during 2007 Southampton backstage broadcast.