Continuity mistake: After Philippe the Mouse escapes from the prison and has swam out the underwater grate hole, another scene shows soldiers riding through the peasants leaving the castle to search for him. In the background, two soldiers can be seen sitting by the moat, eating. One stands and grabs suddenly around his belt, obviously looking around for something. A while after this in a separate scene, Philippe the Mouse is shown surfacing in the moat behind these two soldiers and grabbing the knife from beside one of them and slicing away a cord on the soldiers belt and stealing his coin purse, then swimming away quietly and saying the line about 'I know I promised not to steal Lord, but I know, that you know, what a weak-willed person I am...' Obviously the scene with the soldier standing suddenly and discovering his missing coin purse should have come after the actual 'stealing of the purse' scene.
Continuity mistake: Just a few nights before the solar eclipse, a shot of the full moon is shown. Only 1 or 2 nights later, a clear quarter moon is shown. A quarter moon would appear more than a week after a full moon (not 2 nights) and a solar eclipse can only happen during a new moon, which would be a week or more away from the quarter moon, even though in the movie it happened the next day.