Continuity mistake: While Clarke and Lexa are kissing, Clarke removes the neck strap of Lexa's blouse. In a subsequent shot of them kissing, the strap is back on. It disappears again as they move towards the bed.
The 100 (2014)
1 continuity mistake in Thirteen - chronological order
Starring: Eliza Taylor, Paige Turco, Marie Avgeropoulos, Thomas McDonell
Continuity mistake: At the beginning of the episode as Clarke is walking towards the window in the door, her right arm is already injured, but she doesn't actually get that injury until she breaks the window and reaches through the glass, which cuts her right arm.
Conner: Tell me again.
Raven: You're the most beautiful broom in a broom closet of brooms.