- Big Damn Heroes: Echo saves Bellamy, Clarke, Emori, and Murphy as they're being attacked by grounders for their suits. This was intentional on her part so that she could make it to the bunker.
- Borrowed Catchphrase: Octavia says, "My people, my responsibility," something she obviously got from Bellamy's "My sister, my responsibility."
- Broken Tears: Gassing their people to decide who lives finally breaks Kane, and he cries as he looks at the unconscious bodies on the ground.
- The culling on the ark is mentioned several times, and the bodies piled on the floor who have been knocked out by gas resemble the dead bodies from the culling.
- Clarke's list from earlier this season also makes a comeback as the final deciding factor for who survives.
- Raven's plan earlier in the season to launch people into space in order to ride out the radiation is ultimately how Bellamy and Clarke decide to save their small group.
- The Chains of Commanding:
- Octavia is shown to be in turmoil over her decision to throw over 300 Skaikru outside of the bunker to die and also of the prospect of having to execute all of them. When it looks like the rest of the Grounder's are going to have to kill Skaikru she tells Indra "my clan my responsibility."
- Both Jaha and Kane are forced to knock out their own people with gas and then tell the Grounders whom they can spare and who have to go outside. This clearly traumatises the both of them.
- Continuity Nod:
- When Raven contacts Abby she mentions that the procedure she used last episode can also cure Abby's own tumour related problem from having their Chips forcibly removed.
- Abby once again tells Clarke that "there are no good guys" although this time she aments it by saying that there is at least one: Clarke herself.
- Genius Bonus: Monty says that they are two klicks from the bunker. This is a military term - 1 klick equals about 1,000 meters.
- "I Know You're in There Somewhere" Fight: Kane appeals to Jaha's inner Chancellor to make the right decision about Skaikru's survival.
- Nice Job Breaking It, Hero!: One of the Arcadian's decides to toss Niylah outside of the bunker since he doesn't want one of their precious spots to potentially go to a Grounder. Niylah's treatment causes Octavia to intervene and she says that Skaikru now only has 99 spots left to fill.
- No One Gets Left Behind: Clarke, Bellamy, Murphy and Emori initially have little under 24 hours to find Raven and bring her back to the bunker. However after a run in with some rogue Grounders their jeep gets totalled and their window for collecting Raven closes seemingly forcing the group to abandon her. However Clarke decides to Take a Third Option: go to space with Raven instead.
- Papa Wolf:
- David Miller puts Nate's name in the lottery instead of his own so that Nate has a better chance of surviving.
- The Arkadian boy's father also qualifies.
- Sadistic Choice: Octavia makes it abundantly clear to Skaikru that they have exactly two options for how the bunker plan is going to pan out; either they choice amongst themselves which 100 of their people will live or all of them will die, there is no third option.
- Stock Episode Titles: "The Chosen"
- Take a Third Option:
- When the window of time that Clarke and Bellamy's group can rescue Raven and get back to the bunker closes it seems as if they will have to leave Raven behind. Clarke however comes up with an alternative idea: use the spaceship that Raven has and launch the group into space and back at The Arc to survive the next five years.
- Subverted with Jaha who, instead of loosing any of his people, attempts to gas out the Grounders and hold the food hostage in order to make the Grounders compliant. However Kane points out that the Grounders outnumber Skaikru three to one and that it's unpractical. Ultimately they are forced to pick out the survivors from Clarke's list.
- Title Drop: Murphy refers to Bellamy and Clarke as "the chosen ones."
Recap / The 100 S 04 E 012