Continuity mistake: The way the pumpkin is positioned when Maddy is trying to cut it keeps changing depending on the angle. It is either on its side or upright.
Continuity mistake: When Jonathan falls down the stairs when being chased by the ape, his trousers go from black, to light blue, to black again.
Chosen answer: It was a bottle of turpentine.
Methylated spirit, always coloured purple.