Disproportionate Retribution: Melodie has never been able to find love, so she added a secret algorithm to the hearts feature on Luver that matches people with high hearts to people they're incompatible with so they'll never find love as well.
He Knows Too Much: Melodie killed Lola after she found out about the secret algorithm she installed.
Heroic Fatigue: After the events of The Conspiracy, which affected both his physical appearance and his emotional and mental well-being, David desires a simpler life going forward. He is willing to retire from his job permanently if it means achieving this goal.
The Mourning After: Subverted and Discussed. Just after 2 years, Jones is recently starting to open up onto dating someone else again, which is the reason why he decided to go on a date with the victim. This means that during the 2 year period that we didn't see him, he mourned Zoe's death, with no thoughts of dating someone else again.
Retired Badass: We find out in this case that Jones after the events that happened during The Conspiracy decided to retire early from the force, and has been traveling the world ever since.