Continuity mistake: The broken glass on Nathan's face and arms disappears when he is pouring out the rice, but reappears when he is yelling into the PA system.
Horrid Henry Tricks the Tooth Fairy - S1-E7
Continuity mistake: When Peter bring his bag's into Henry's room, if you look closely at the wall behind Peter it is pink, but in the next shot if you look to the right, the wall is green - the usual colour, it then reverts back to pink again.
Continuity mistake: In the last classroom scene, the blue oval design on Gabby's cap appears and disappears between a few of the last shots of the scene, first when Vinnie runs up to Professor Q (because Rocket went ahead and switched both his and Gabby's test papers) and later when Professor Q was talking about how he was ∞ proud of Vinnie. (00:10:10)