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.
Continuity mistake: When Le Fley runs through the house to be shown that the painting is missing, he is seen in three shots; in the first he is barefoot, in the second he appears to be wearing light-coloured mules, loafers or some other lightweight footwear, and in the third he is barefoot again. It is a little hard to see this in the second shot as his feet are moving quickly, so I could be mistaken, but it does look like he has something on his feet.
The Curious Tale of Mr Spearfish - S3-E1
Continuity mistake: The bullet marks on Lenny keep changing places.
Continuity mistake: Hugo puts his mug down on the table before going to fetch a book. As turns back from the shelf, the mug is back in his hand, and then as he crosses the room, it is gone again. (00:35:55)
Chosen answer: It was a bottle of turpentine.
Methylated spirit, always coloured purple.