No, you just switched to power jump (41:15 and 49:01), which works differently - it expects you to hold space to jump higher, hence the delay.
No no, I am aware of when I switched to powerjump (and did not fully understand how it works). I am talking about random delays in jumping. You cannot see it in the stream, because you cannot see the inputs. Even then it would be hard, because it’s just 100-500 ms, a clearly noticable lag when playing, but hard to feel when watching. It may be that the whole game is hanging, too, as it sometimes feels like frames are dropped as well. When it happened, I changed nothing about the selected jump, I did nothing, I just jumped a few more times and there was no lag anymore.