Kiera being reunited with her partner, Elena, after some months for Kiera and 37 years for Elena.
The cosplayer wedding.
The psych program agreeing to leave Kiera's memories intact, deciding that she had successfully begun readjusting to her new circumstances.
Future!Alec reconciling with Emily.
Kiera beginning to see the shades of grey inherent to the notion that "protecting the system" is not the be-all and end-all of a police officer's existence, motivated by Carlos's prodding and the faculty adviser's heartfelt plea for understanding.
The moment when Carlos learns the truth about Kiera; faced with a scenario where the only explanations are that Kiera is from the future or that she's been working with a serial killer, despite the various unanswered questions of her past so far, Carlos decides that the idea of Kiera working with a killer is more impossible than the idea that she's from the future.
Also, when Kiera secretly clasps hands with her police squadmates just after having been saddled with a huge debt for choosing to save two children from a fire instead of a corporate muckity-muck.
Kiera's relationship with Brad, based on the mutual experience of being out of their time and having trouble adapting. Even when he learns that he killed the other her and shares that, she doesn't seem to hold it against him.
The once-imprisoned Alec Sadler is reunited with Emily. He even seems to come to terms with Kiera before he leaves.
In the following episode, Kiera more or less has to literally watch her future die, then Alec hugs her to comfort her.
After the Crapsack World of 2039 is irrevocably destroyed in Final Hour and Kiera moves forward to 2077, Edouard Kagame and Julian Randol helped Carlos Fonnegra, Emily and Alec Sadler avert both the corporate-faction warfare of the 2030s of Brad Tonkin's time, as well as the Corporate Congress dominated future of the 2050s of Kiera's old timeline.
Kiera reuniting with Alec Sadler in the new 2077, made all the more poignant because he wasn't sure if she had survived the temporal transition.
Additionally, Kagame and Sadler have become warm friends, shocking Kiera as they banter with each other and explain the changes they made, inspired by her departure in 2015 to make a better world for her to come home to.
Finally, the Carlos Fonnegra memorial park, showing that he served as head of the VPD for thirty years.