First is the moral issue of the robots. What moral standards should robots hold when it comes to assisting humans? Should they do whatever the master told them to do or only do what is legal according to certain laws?
Second is what factors in this movie that attracted Frank to the robot are. At the beginning, Frank really dislike the robot and refused to let it stay on. He was not cooperative at all. But at a certain point, the robot became his friend. He walked with the robot, talked to the robot, and made plans involving the robot, and even became dependent on the robot. When the robots' memory is a threat again Frank's safety, Frank tried everything to avoid erasing the robot's memory.
Third is the customization of the robot. People can mass produce robots. They are identical. When the memory is removed from the robot, one robot is just as the same as any other robot. When Frank looked at a robot with the same appearance of his own serving other people, he paused a little bit. I figure that humans have a little bit of sense of exclusion. People do not want others to share what they have that are very personal or close. Unlike uniqueness of human, these robots are not customized. How do people handle this feeling of the same type of robot serving all other people? People might feel that themselves are not special. What then?
I need to go back and watch again.