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After Fumi had told Sharna that she needed a care robot, Sharna asks her if she got the idea from a movie. This is a reference to Baymax from the film Big Hero 6.
After Makimura introduced Fumi to the female robot Ell, a number 5 can be seen on Ell's upper left arm. This is a possible reference to the numbers seen on the arms of the characters from the Vocaloid franchise.