I'm a bit confused by the sequence of events when Alex returns to Mr Alexander's house (after his release from prison).
Initially, it is clear that Mr Alexander does not recognise Alex as being responsible for the break-in at the start of the film, but recognises him only from the newspaper and wants to use him as a pawn for political purposes. Mr Alexander then makes a phone call, presumably to the man and woman who later arrive and question Alex. It's only after the phone call that Mr Alexander hears Alex's rendition of "Singing In The Rain", and is visibly disturbed (implying that at this point, he recognises Alex). Mr Alexander even says to Alex that he "phoned some friends while you (Alex) were having your bath", implying there was a single phone call.
Later on, the man and woman arrive and start questioning Alex. However, they don't act surprised when Alex passes out from the drugged wine. How can this be the case? They didn't know who Alex really was when Mr Alexander called them (nor did Mr Alexander), and his invitation at the time was sincere. So there must have been a second phone call from Mr Alexander to his colleagues, informing them of his revelation, and new plan to drug and torture Alex, with their assistance.
This seems like a glaring omission to me, and makes for a very confusing scene. Is there something I'm misunderstanding?