|“||Everything we thought we knew about the ground is wrong.||”|
|— Clarke to the 100.|
Having discovered that Jasper may still be alive, Clarke, Bellamy, Murphy, Finn and Wells set out on a mission to locate their friend and are shocked at what they find. Meanwhile, on the Ark, Abby is determined to get to Earth, and enlists Raven to craft an escape pod.
- Bellamy (to Wells): "What's wrong with a little chaos?"
- Finn Collins (to the 100): "It turns out, when the last man from the ground died on the Ark, he wasn't the last Grounder."
- Clarke (to the 100): "Everything we thought we knew about the ground is wrong."
- Clarke (to the 100): "You idiots. Life support on the Ark is failing. That's why they brought us down here. They need to know the ground is survivable again, and we need their help against whoever is out there. If you take off your wristbands, you're not just killing them. You're killing us!"
- Jaha (to Kane): "You rushed to execute the woman who saved my life and if I were dead, you would be Chancellor now and Abby wouldn't be here to oppose you."
- Clarke (to Bellamy): "Because you want them to follow you and right now they're thinking only one of us is scared."
- Octavia Blake (to Atom): "You're too hot to be my brother's bitch."
- Monty: "You sure about this? Your brother won't approve of you helping us contact the Ark."
- Octavia: "He's not my keeper."
- Bellamy (to Murphy): "We don't. Spacewalker thinks he is a tracker."
- Abigail Griffin: "I looked up your file. You're the youngest zero-g mechanic on the Ark in 50 years."
- Raven: "52, but so what?"
Notes and Trivia
- The episode's title refers to a class that people on the Ark were taught in. It is mentioned by Wells Jaha.
- The disfigured skull Clarke Griffin picks is the only disfigured skull shown in season one.
- It is also part of the first skeleton shown in Season One.
- At some point, Wells Jaha found or made a shovel between this episode and the last.
- Wells is shown to be resourceful enough to have crafted a backpack from bits of the dropship, suggesting that he could've potentially made a shovel as well.
- In camp, a few members of the 100 are playing tribal music with buckets and sticks.
- The blue shirt Bellamy Blake wears in this episode came from one of the Delinquents who died in "Pilot".
- He takes the shirt from Wells and puts it on. Clarke however, has an actual backpack.
- Bellamy gives Wells the nickname "Prince".
- Raven Reyes's helmet has a raven on the side of it.
- Both Bellamy and Wells came to Earth to protect someone they love.
- Bellamy came down to protect Octavia.
- Wells came down to protect Clarke.
- The bioluminescent butterflies Octavia discovered may be a byproduct of the nuclear apocalypse.
- A nuclear winter would block out the sun, forcing the butterflies to evolve.
- The bioluminescent butterflies are the first bioluminescent animal shown on the show.
- Bellamy hesitated to pull Clarke up from a Grounder pit because he needed the Ark to think she was dead. If she fell she would have died.
- On the Ark, the Council consisted of seven members, including Chancellor Jaha.
- Clarke's watch is shown to be on her left wrist, opposite of her wristband.
- In "Pilot", Clarke wore it on her right wrist.
- Bellamy ties Atom to a tree using seat belts from the dropship.
- The Grounder who spies over camp may very well be Lincoln. However, this has never been confirmed.
- The outfit this Grounder wears bears a striking resemblance to the one Lincoln wears when he finds Octavia in "Twilight's Last Gleaming".
- Other evidence that suggests Lincoln has been watching over the camp: the drawing of the 100 camp and the tally he has in his sketchbook.
- The facial structure, skin tone, and eyes also match that of Lincoln.
- It's suggested that Jasper was taken by the Grounders because he crossed a boundary when he went across the river. Their reason for stringing him up is suggested to either be a trap for the Delinquents or more likely the panther that Wells killed.
- This, "Contents Under Pressure" and "Etherea" are the only three episodes where no one dies, minus the panther shot by Wells.
- In "The Garden," no one dies on-screen, but several bodies are found and causes of death are mentioned.
There are no deaths in this episode.
Behind the Scenes
- Earth Skills was watched by 2.27 million viewers and had a ratings/share of 0.7/2 in the key 18-49 demographic. 
- This episode was filmed along with the next episode; Earth Kills.
- In an interview in February 2016, Jason Rothenberg said the two first episodes (this one and "Pilot") are the worst episodes of the series. The episodes have a more "teen drama" feel, causing many viewers to decide not to watch the show further.
|Can't Pretend||Long Way Down||Tom Odell||Purchase|
- Kondolojy, Amanda (March 27th, 2014) “"Wednesday Final Ratings: 'American Idol', 'Modern Family' & 'Suburgatory' Adjusted Up; 'Mixology' Adjusted Down"” TV by the Numbers