Deepinder - I think the clip you mention may have been from the 'Helga & Frank' show. That clip is on YouTube (flagged as 'German TV'), but a 'performance' of "Can-Can" from the same show doesn't seem to be. (Note both tracks are mimed; the show must date from 1978 at the earliest and hence Holger is absent).
The 'comedy' aspect of the show seems to be very 'Benny Hill' - my German isn't great, but some 'humour' transcends language barriers (there's a re-enactment of Barbara Windsor's best-remembered moment from Carry On Camping).
I have the Can CANDVD boxset. It has several dvd and cd, but if you can stick it the BBC TOTP is there and then cuts into a German TV outing on what seems to be a show infused with comedy. It is an excellent item to get, I like the 1972 Can Gymnasium concert which has a juggler that performs an amazing routine
I have, Billy, but not in over 20 years! An older pub pop quiz team mate lent me both that album and Monster Movie; I seem to remember being so dazzled by "Yoo Doo Right" that I could barely take anything else in before having to give the LPs back!