Continuity mistake: When McLeach discovers Cody in the hole, McLeach reaches in with his shotgun to help Cody out. It would have to be a very large gun to reach into the bottom of the hole, yet when Cody is pulled out, the gun is shown to be quite small.
Revealing mistake: When "Krebbs" the koala is discussing with his other friends in the cell. If you look closely, you can notice a blink in the outline in the "Krebbs" nose. It's a clear ink & paint mistake of the blur line.
Continuity mistake: When the delegates assemble in the Great Hall, it is first shown that Canada is sitting to the left of Morocco. But shortly afterwards, Morocco is suddenly sitting to the left of Iceland, and Canada has mysteriously vanished.