Other mistake: When Harry and Hermione travel back in time with the Time Turner, Hermione states that the time is 7:30, we then see them run to Hagrid's shack. As the camera passes through the clock on the castle, it shows the time is either 2:00 or 12:10. As well as this we are told that Buckbeak is to be executed at sundown, but he is executed in broad daylight, looking more like midday. (01:43:40)
Mcgregorc00
3rd Nov 2017