Large clouds appear and disappear within seconds when the children are on the church roof.
Dust and dirt repeatedly disappears and reappears on Louis and Martine's clothing.
The ladder the children use to access the church roof changes position between scenes.
When Louis and Martine lie down in the hayloft, they have pieces of straw in their hair; another shot follows, clearly meant to be continuous from the last, and the straw has gone.
Martine's mother at one point mentions taking Martine receiving treatment for flat feet, which her doctor claims was caused by Martine running around barefoot. Going barefoot does not cause flat feet, a fact known to doctors at the time.