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.
Fan-Preferred Couple: Fans seem to like Yui and Synchro as a couple thanks perhaps to the Ship Tease that exists between them since earlier episodes of the series.
Fridge Logic: It makes so much sense when you think about it that Mugihito was both Grosser and Inukai's voice actor in the series. Inukai built Grosser as his own image to dictate some authority as ComNet's host computer. The fact that he couldn't escape from him, is because he was built to act and think as him, so Inukai took advantage of saving his memory and became amnesiac as a result, so he couldn't find him so easily. This also explains why he couldn't find the correctors by his own account (since Inukai just ordered them to hide), and why he tricked Haruna taking his creator's image.
Growing the Beard: The first season was good, but the second was a improvement for those who didn't like the first.
Hilarious in Hindsight: José Luis Reza, Control's Latinamerican dub actor, ended up being casted as Captain Harlock in three different Captain Harlock properties: Gun Frontier, Cosmo Warrior Zero, and the 2013 CGI anime movie. Control's first appearance in the anime series was under the "Captain" Shadowcat alterego, an expy of Harlock.
Rescue’s affection towards Freeze could be seen as a romantic attraction, and it doesn’t help that Freeze acts somewhat tsundere when she is present.
Yui and Ai. As long as the second season goes up, it's clear the intention of defrosting Ai Shinozaki with help of her neighbor and eventual friend, Yui. They are opposite poles, and while Yui tries so hard in seeing Ai as a friend since their schools' Drama Club co-joint, their scenes together fuel the shiptease (especially this afforementioned episode, where the drama they perform also plays with the idea).
Nightmare Fuel: Kurokawa when he finds out that he is dead in the real world... and the Boggles concentrates in him transforming him into a monster. It's a gruesome image and it's possibly the only thing you will remember about itself.