Overall I thought this movie was good fun, something for a single viewing but not to put on a "Favorites" list for repeated viewing. In a nod to the title, it does feel like "Mistakes Were Made" in production; the movie feels incomplete. Like a car missing a seat, rear view mirror, a radio, and a tire. Whether some key scenes were left out, or cut for time, there is a sense that with appropriate tweaking this movie could have been much better. Additional background into what prompted this child to create the fantasy world he put himself in; why a polar bear?; what is the obsession with Russian spies?; what's up with the scarf? There are many things hinted at or teased, but we are not shown the reason for them. The potential is there, and other movies have used similar plot devices successfully, but like my car analogy there are parts missing.
