Animations of movement at joints (with some errors?) more extra credit opportuni

Animations of movement at joints (with some errors?)
more extra credit opportunities …
Below is a video made by some high school students. I noticed a few of their moves were not quite right … can anyone identify which ones? (note – this question is about the movements at joints; though there is probably more you can find “off” about the video in general)
You will receive 5% extra credit points (.5) towards this forum discussion grade for identifying an “incorrect movement” from the video correctly, if no one else has identified it yet (but .5 pts max for the week, if answering questions from other posts this week too) 🙂
Note: there is more than one “incorrect movement” … but you only need to identify one for EC.
(the relevant section of the video runs from :35 to 3:45 … no need to watch beyond that)
I need a response to this question. Here is the link for the video on youtube.