In the Oldboy (2013) movie, when Joe Doucett was having sex with Marie, they did not know that Adrian was filming them. Later on the show, Adrian shows the sex footage to Joe Doucett in order to upset him.
Well, Joe had been locked in solitary for a couple of decades. If Adrian had been grooming Marie to be attracted to a certain kind of man, the right ingredients would be there for some type of chemistry. As far as the video, He was probably keeping tabs on Marie her entire life. Every place she ever lived was probably wired. Plus, there is the issue of hypnosis like in the original film. If it was done to Joe, it was probably also done to Mia/Marie to get her to fall for joe. This would probably make the choice of hotel rooms more than coincidental, also.