Other mistake: In first episode Wells apologizes for locking up Clarke's dad, then acts surprised when she tells him he got executed, when in episode 3 it's revealed they both assisted in the execution.
The 100 (2014)
1 mistake in show generally
Starring: Eliza Taylor, Paige Turco, Marie Avgeropoulos, Thomas McDonell
Earth Skills - S1-E2
Clarke: Follow me.
Bellamy: And why would I do that?
Clarke: Because you want them to follow you. And right now they're thinking only one of us is scared.