Hemmings cameo
I remember seeing this about five years ago when it was on British television.
It was pretty bad despite David Hemmings' claims in his autobiography 'Blow Up and Other Exaggerations'
When I saw it I was sure that Hemmings made an 'off-screen' cameo.
If I remember rightly it was a scene in a church where some work was taking place. There was a voice off camera giving instructions that sounded very much like David Hemmings (he had a very distinctive voice).
This wasn't a goof where the director's instructions could be heard on the soundtrack. It was deliberate and I'm pretty sure it was him.
I tried to have have it added on the trivia page but the IMDB wouldn't accept it :-(
Its on BBC1 tonight, I'll double-check it.