Plot hole: When Daisy is killed, Dan comes around to collect her things. So we'll be able to see him reading one of Daisy's love letters from Ben and accuse Ben of Daisy's murder, when Dan takes the box from Stuart, who is holding it with his hands underneath, keeping everything in, he holds the box with his hands on the side, deliberately, so the love letters fall out to the ground - and how convenient that nothing else falls out, just the love letters. But the letters were written before the girls arrived - they saw them - so how could Dan accuse Ben when the blue one has Ben asking Daisy to meet him in the summer house, but it was days ago, not relevant now.
Plot hole: When Rosemary discovers the side door to the church and a plastic knock, from an arrow, on the floor, she jumps to the conclusion that the arrow was shot from the side door. This all makes sense - this knowledge is how they catch Mr Danvers - but there are too many branches from the Yew tree to make this possible.
Other mistake: When we see Sam driving, not once does he turn the steering wheel, not even a centimetre, and not when he has a heart attack and collides with a truck.
Continuity mistake: There are two things going on at once - Mr Danvers and the girls are at the Danvers house while the archery lesson is going on - but suddenly they merge, with Mr Danvers and the girls at the archery lesson, which, time wise, isn't possible.
Continuity mistake: Near the end, Laura is pouring the champagne, but while she's pouring it, Lydia and Penelope have their glasses filled to the top in front of them, but Laura hadn't finished pouring it yet.
Plot hole: When Laura, alone in the girls' room, hears the noises in the attic, she runs to get Rosemary. Problem is: Horace is the one who makes the noises and when Laura finds Rosemary, Horace is in the bar - not downstairs, making noises as he should be.
Other mistake: When Malcolm is found dead with an arrow in his chest, the arrow is pointing down at an angle, which means it came from someone high up, but, later, we find out it came from someone of around the same height and standing on the ground, not high up on a ladder, or on a rooftop, which it should be, to get that angle.
Continuity mistake: All the times the girls have visited Mr Allbright's rooms, they've had to press the intercom and get buzzed in. But on the last visit, Rosemary just walks in without waiting to be buzzed in.
Plot hole: The first man to be killed is a psychiatrist - "a very private man". So, if he was "very private", how did the "hip man" know if he did or did not have any psychotic patients who would want to kill him? He wouldn't.
Plot hole: In the garden, when Rosemary and Laura haven't done much clearing away yet, a girl loses her mobile in the garden. Instead of spending "hours" searching for it, why don't they just ring it? Or explain that the battery is dead and they can't ring it?
Swords into Ploughshares - S2-E7
Continuity mistake: Laura is handed a cup of tea that is only half-full. But when she puts the cup down, it's full.
Orpheus in the Undergrowth - S2-E2
Plot hole: While the girls are trying to work out who killed Jeremy, Rosemary says she thinks it's Julia - Julia owns the flat that Jeremy and Marcia live in - so Laura says "Why would she want Jeremy dead?" And Rosemary says "To sell the house for a greater amount of money." But that's wrong: When someone dies in a house, the house sells for less, not more - not many people want to live in a deceased estate.
Continuity mistake: Right at the beginning, Laura throws a rock through her window that has a floral arrangement in it. But when we look at the windows again, none are broken.
Answer: Regents park.