It is important that people understand how a 2x2x2 mechanism works to avoid issues with them. 2x2x2s have a fixed corner, on some 2x2x2s this is done by the core itself trapping a specific corner in place while on others, like the one in this video, it is done by having 3 of the 'edge' pieces having an extra bit which allows them to trap a corner in place. You must never attempt to force the fixed corner to twist as this can cause it to be permanently deformed.
Other Posts
Is a 4x4 Rubik's cube harder than a 5x5?
Many newer cubers can get confused and think that they have to solve a 4x4 or a 5x5...
DianSheng Petaminx unboxing | obviously the best
The DianSheng Petaminx is the first mass produced...
Luke Garrett becomes the best cuber in the world (by sum of ranks)
Luke Garrett, from the United States, has recently become the best speedcuber in the world by average sum...