When Samantha closes the storybook, the white silhouette of the gremlin can be seen already covering the color illustration.
When the "magical" Jack O Lantern runs out from behind the bush with Aunt Gladys, you can see the white socks and sneakers of the actor who played her nephew Mike (who was still in the bushes with the ghoul and gremlin). The "magic" pumpkin supposedly floats and has no feet.