Go to this video https://www.youtube.com/watch?v=hEjLJFftuKI
Watch in HD like you said
Start watching at 0:42 seconds and about 0:44 when the girl with the red jacket crosses behind coopers nose, it goes transparent. And you can see a red hue around his lips.
The blue/green Screen Background is reflecting on his skin at the edges especially when he turns a certain way. The computer isn't distinguishing between the green/blue on his nose with the green/blue in the back ground.
This isn't ONE occurrence. It happens several times in the full length video.
If you are going to analyze then do it properly. Otherwise you are misleading people.