@Buenchico
Thanks for posting that vid. I don't need to watch it again, because, every time I hear or read someone use phrases along the lines of "foreigners: out", the song plays in my head.
My memory of the film's plot has faded, so I can't remember quite why Mel Brookes' character was so keen to produce a flop, unless it was his character's cynical belief that, if you put on a show which is artistically great, it is doomed to be a financial flop and thus logic dictates that you produce a piece of what you believe to be trash but which the paying public adore.
The humour comes from the production being intended to be deadly serious but, unintentionally, generates big laughs, on opening night.
With regard to the publicity stunt latching onto the UKIP conference, I must reluctantly concur that it looks deliberate: the conference would have been booked months in advance and it's date and location were in the public domain, so not the slightest logistical difficulty getting the dancers there.
Furthermore, I think they've really shot the pooch. Allusions to Nazism should not be used frivolously.
The only respect in which they might be right is that the Nazis emerged at a time of economic chaos, had a "strong leader", charismatic character at the helm and the opposition party was no longer trusted, by the population, to run their economy (hyper-inflation, war reparations to pay etc). The racism and Jew-hating didn't really get going until after they were elected into power.
The dance troupe were therefore only trying to echo the fears of those of us who are to the left of Farage. If UKIP has collected members from the likes of BNP/EDL, gets voted into power and then the membership do to him what the Tories did to Thatchler, then you can see how easily the country could progress to "stage 2".