When the blonde in the elevator became a pretender played by Tom Hardy, it also had a very clever shooting effect with the mirror.
Seeing this, I believe that this is the effect of using post-synthesis.
Below is a set of coherent arc-shakes, Tom Hardy's pretenders once again made character changes. Since the shots are coherent, the possibility of using post-synthesis is significantly greater.
The male character and his wife are the pioneers of the dream world, and they continue to deepen their dreams in order to study the dream.
After they reached the fourth floor of the dream, they could not return to reality, so they lived in the fourth layer of dreams for 50 years until they died.
The film is about the story of the male leader who is a dream-maker and led his inception team, entered other people's dreams, steal secrets from other people's subconscious, and reshaped the dreams of others.