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.
Crowning Music of Awesome: In the drama, the Capsule song "Flash Back" starts up every time Akiyama ends up turning the tables. The movie covering the finals of the tournament may get another one with its theme song, "Love or Lies."
Freud Was Right: The fact that Akiyama is so attached to Nao due to her being incredibly similar to his mother - both in looks, and personality. Yikes.
What an Idiot: Nao, in almost everything she does at first. Fukunaga comments on this at the end of the first period in the fourth round.
"This girl really is...a flaming idiot."
Subverted and eventually averted. Subverted in that Nao's actually extremely intelligent, but she allows her tendency to believe the best in people cloud her judgement and never seems to get particularly angry when she falls for traps. Averted later in the manga when she becomes one of the best players in the liar game.
The Woobie: Abe. Beaten by her stepfather and told right to her face by her own mother that she shouldn't have been born.