Another analysis on a short video.
The lighting in the scene perfectly matched the character (or the other way around) the reflection on the character on the floor and some light on the edge of the robots body, which is common for a reflective object to have.
Edge blur was most likely used on the robot so that it integrated better into the scene and looks more realistic. Shadow was well done too. The animation on it fits with the character
I think that this was one of the better 3D Integration videos I have seen.