The Mel Gibson-produced remake of Potter's brilliant "Singing Detective" is, in many regards, an under-rated adaptation (by Potter, shortly before he died from liver cancer) but one must be very familiar with the original source material to appreciate it.
In short, without dissecting the 90-minute film scene-by-scene, the movie is Potter's construct of what a bad Hollywood reimagining of "Singing Detective" would look like. The film was shot to reflect this. The sets -- almost all interiors -- are deliberately flimsy in construction and the walls appear to be only half-painted. In the final shot of the film, all of the lights in the hospital corridor extinguish at once, a true "reveal the narrator" moment. (The narrator = the camera lens. You have been watching a movie, Potter appears to be saying, not reality).
All in all, though, Potter's original 6-parter for the BBC was a masterpiece in longform televison and a remake was ill-advised.