In one scene Poroit is standing next to the tree where the wasp nest is and there are no wasps, then in the next scene the wasps are back wasp buzzing around.the tree with the nest.
Poroit says he substituted washing soda for the Potassium Cyanide. However washing soda is Sodium Carbonate which is powdery while Potassium Cyanide is crystalline like table salt. They show a crystalline compound being added to the tea which could not be washing soda. In addition, it is immediately obvious that the washing soda is not the crystalline Potassium Cyanide.
Harrison looks at the diary and underlines Monday the First of October. This date only occurred in 1934, and yet there was also a car featured that was not introduced until 1936, as well as a magazine cover from July, 1935.