These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Tear Jerker: Night's death. It's just as emotional in the live-action drama, where Gaku is seen looking over the stored body of Night, wishing him "sweet dreams, 01" and leaving. The last shot is an ascending view of Night's body in the storage container, wearing his scarf.
They Wasted a Perfectly Good Plot / Unfortunate Implications: The story could have been alot deeper and most likely betterhad Riiko realized that everything she thought she wanted in a guy (in which she eagerly programmed into a figure) turned out to be not how she thought it would and rather chose the genuine, real guy who had always loved her and stood by her, rather than choosing a robot programmed to be a "perfect" guy. While Night is likable by any means and seems to eventually harbor genuine feelings for Riiko, it still makes her come off as rather shallow and even dumb. It's particularily grating in the scene where she chooses Night over Soshi, on the basis that "Night always protects me!" when 1. apparently she forgot the detail where she programmed him to do so, and 2. Soshi happened to be at the scenes, protecting her as well without her knowing, overall making her decision just seem unfair and poorly thought through. Then again, the mangaka did state that she didn't mean for the story to be deep, leaving the conclusion that it had a good chance to be so, but she either didn't realize it herself or simply didn't aim to write more than what it ended up as.