Troy is holding three wooden sticks to throw at the Aunt Sally doll. You then hear the sounds of him picking up four more sticks. Cut back to Troy holding six sticks under his arm,
In the game of Aunt Sally, each competitor throws six sticks. After Tom Barnaby throws his third stick, he is clearly seen with four left to throw.
*Spolier* When Simon's corpse is viewed in close up for the first time, his eye clearly moves.
When Troy is at Jay's place and asks her where her plates are kept, she replies that they are in the cupboard by the cooker. Troy then goes two cupboards down from the cooker, rather than the cupboard next to the cooker, and finds the plates straightaway.
At around 1:11:17, a tube of lipstick is referred to as ice-pink by one of the characters; ice pink is a light shade, the tube in the science is clearly a darker red.