Continuity mistake: Whenever young Riley is pulling the wagon around the house, Fear stops her at a white cord in an outlet. In the next shot, it is a black cord.
Continuity mistake: At the very beginning of the movie when Riley is born, the shot from behind shows the mother wearing the glasses. In the next shot the glasses disappear.
Continuity mistake: Bing Bong hurts his leg and cries candies. One with a grey wrapper vanishes in the next shot. (00:40:00)
Continuity mistake: On Riley's first day of school, she has a blue notebook on top of some other books on her desk. After her story about Minnesota, she sits down, where the notebook is now under another book.
Chosen answer: Look carefully and you'll see that Fear gets stuck in a bunch of memories, then the tube bursts.
Lily Harrison