Revealing mistake: At the beginning of the film, Stan reverses the bus into the manager's car. While the manager is under the bonnet looking at the engine, causing it to fall on him, you can see a rod with padding on it to stop the bonnet from hitting the manager. It is gone in the next scene.
Revealing mistake: When Stan cuts up Arthur and the motorbike crashes into the bridge, you can see the stunt man throws the suitcases into the water.