Plot hole: It turns out in the climax of the episode that there are no bullets left in the gun and Miss Fisher knew it. That would mean then that she deliberately wasted minutes with Simon bleeding out on the floor when Chaim was holding them at gunpoint with an empty revolver, for no discernible purpose.
Plot hole: Miss Fisher and Samson have to find the right, narrow, timeframe to sneak into the ringmaster's tent and go through his belongings. But they seem to have an unlimited amount of time once afterwards, since they flat out take the big crate he has in plain view containing all sorts of incriminating evidence, and then have all their time to get to the station to bring the evidence to Jack, compare serial numbers, have a lab check on the vials, even dig up graves, all without Mr. Jones getting suspicious in the slightest.
Plot hole: Talking about the murder weapon, the coroner says that the wound was a "horizontal" stab. Nerine's confession is ruled out because she mimics the attack at an angle. Funnily enough though, during interrogation, Jack himself makes a remark about the stage being a spot overseeing the room, and the killer was in fact on stage, and standing. When we see briefly the flashback of the murder, it's clear that the trumpet is way above the head of everyone dancing. So the projectile wound would hardly be "horizontal."
Plot hole: At the end of the previous episode Foyle infiltrated the Fisher household and cut the telephone line. However in this episode, taking place just the morning after, no mention at all of the event is made and Bert and Cec off camera phone the police with no anomalies reported.
Plot hole: The coroner finds the stones "in the nasal cavity" after Miss Fisher's intuition, but he already had examined it in both cases due to the bleeding. Also, it's inexplicable how with the previous case being ruled as the death of a drug addict with no particular findings, the coroner would have still lying around the body to examine for autopsy even when Hugh said the body was found a week before.
Plot hole: Camellia is awake when she is being carried away, and later in the episode she fights using martial arts. It is unclear how even caught by surprise she was apprehended without a single sound being made except two times by doors slamming and not even a whimper...considering she is even not gagged.
Death at Victoria Dock - S1-E4
Plot hole: The anarchists were alarmed enough by Nina running away to abandon their safehouse in a hurry, but still go through with their plan to rob the bank as planned - hard to see why, since it was a generic bank robbery and nothing about it seemed time sensitive - and look totally dumbfounded by Peter's presence or the fact that it could all be a trap, when it's obvious their plan had been exposed - it's why they left, after all.
Plot hole: The murder weapon during Miss Fisher's demonstration hardly appears to generate enough momentum not just to send a projectile across the room with lethal force, but also do it achieving full penetration through clothes, disappearing entirely inside the body so the coroner wouldn't notice. That's assuming that the coroner did not even bother to in fact open up the cadaver and perform autopsy, which would be strange, especially with a weapon of undisclosed characteristics, when finding out more about the depth and damage to internal organs would have been crucial. And with any autopsy the dart would have been found, solving the case almost immediately. (00:49:45)
Answer: Louisa's watch was broken during the struggle to get away from her attacker.
Bishop73