Möglicherweise haben die Deutschen Gastgeber den Namen “Hühnertanz” für die englischsprachige Touristen verwendet, aber auf deutsch heißt es ausschließlich “Ententanz”; siehe: HttpS://De.wikipedia.Org/wiki/Ententanz
On at least one occasion, Schulz used a friend’s telephone number in the strip as a gag. Pity the poor soul(s) who had that telephone number in other area codes.
Impossible to say, but probably a transmission error from the syndicate. As Petting Machine reported, the missing strip has finally been restored. The same error happened to Breaking Cat News on Sept. 22nd (except that there it was restored two days later, instead of the week it took here). Perhaps it depends on the number of people who complain.
That reminds me of the bridge in the Calvin & Hobbes strip for Wednesday 26-Nov-1986; see: Https://Www.GoComics.Com/calvinandhobbes/1986/11/26