Universal Joint Error

At 0:42 it says that the small indicator shows the rotational error. It actually shows the rotational angle. At 1:29 it says that the output shaft remains at the 6 and 9 o&position. It should be 3 and 9 o&position. I will present more videos soon on why even for LEGO MOCs it is important to think about how to add universal joints correctly and on my nice light mod too.