When Amy tells their grandma that they need to contain her spirit Jake is standing behind the grandma but in the next scene he has his hands on the scarecrow.
When Jake is talking to Heartly by the snow globes you can see the scarecrow that the grandma will body snatch behind them and it sways a little showing there is someone in it and not just a scarecrow.
When Amy tries to capture her grandma in the jack o lantern she says she escaped by going through the eye holes.
Yet you can see lights reflected on the eyes showing that it is one solid piece and the eyes are just painted black and are not eye holes.
Yet you can see lights reflected on the eyes showing that it is one solid piece and the eyes are just painted black and are not eye holes.