Plot hole: The prosecuting attorney told William, "We've got no video, no photos, no eyewitness except you" and, "Your biggest problem is there is no gun... This case is so paper thin the judge's probably gonna throw it out, and Danny Fetter is gonna be back on the streets... Basically, it's your word against him." William correctly replied, "That's bullshit..." There would still be enough circumstantial evidence (e.g, gunpowder residue, offender placed at the crime scene) to acquire a conviction. (00:10:03 - 00:10:45)
Plot hole: This adaptation further exacerbates the problem of previous movie and TV versions; in the novel, Jackie would make the female designated witness talk over and over pretending also to get drunk after Linnet left to go to bed. In the Ustinov version it happened too, but the diversion didn't seem to last more than a couple minutes. Same in the Suchet version. Here, Simon even provokes Jackie practically the moment his wife exits the room. There's no time whatsoever for her to change and get in bed, let alone fall asleep.