Sir Billy Connolly (Frankie) says that while filming the sex scene with Julie Graham (Melanie), Director David Leland urged him and Julie to be more enthusiastic, vocal, and vulgar. Billy said that he's not like that in real-life. Just "mildly grateful" that he's having sex.
Sir Billy Connolly said that he had been waiting for a good reason to finally shave off his famous goatee beard, but never had one, until director, David Leland, asked him to do it for this film. After doing so, he remarked that when he saw himself in the mirror, he "looked like a potato"(!)
When Liam Neeson(Danny Scoular) was shooting for this film he was also shooting for The darkman 1990. He says in those days it was just getting up from the bed and doing shooting and then again back to bed.