Continuity mistake: When Charlie is climbing down the cliff the rope comes undone from the tree stump, but a few seconds later you see it still tied to the stump. (00:12:00 - 00:12:45)
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.
Continuity mistake: A few moments after Pike and his group leave the room because they didn't find prisoners, Octavia pulls her own head out of the hole and says "all clear." Then she pulls two machine guns out of the hole with both hands and puts those guns on the left and right sides of the hole separately. In the next shot, those two guns aren't in the same position. Both are in front of the hole near each other. (00:28:58)
Continuity mistake: Toward the end John Murphy gets a collar around his neck. In subsequent shots the lock on the collar is alternately locked / open. (00:34:00 - 00:35:00)
Continuity mistake: During the funeral on the oil rig, right after Octavia collapses under the effect of the drug, Clarke has a sturdy, simple metal cup in her hand, but in the following shot we see her dropping a completely different, clay-like and more elaborate cup that shatters when it hits the floor. (00:39:40)
Continuity mistake: When Clarke gets in Finn's tent with Raven to check on his wound you can see the cut running vertically on his chest, but during the whole previous episode the wound was horizontal. (00:06:35)
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.
Continuity mistake: When Clark walks into the hall full of dead grounders and it shows her looking at them. A guy on the right moves his head slightly as if getting comfortable. (00:18:50)
Continuity mistake: In one shot when Jasper is unconscious under the table there's a cup on his chest. But in the next shot when Bellamy and Monty go to get him up the cup is suddenly gone. (00:09:00)
Continuity mistake: In season 3 episode 16 Jasper was shot in his left leg. In this episode he has his right leg bandaged.
Continuity mistake: When going to retrieve Murphy from the dropship, after Bellamy subdues his sister, his gag is covering his mouth. Then, as Pike moves towards him, suddenly it's magically not. (00:22:20)
Continuity mistake: In the opening scene while Lexa and Clarke are talking, Lexa's shoulder guard keeps shifting on her shoulder from one shot to the next, as does her red sash. (00:01:20)
Continuity mistake: At the very beginning of the duel scene you can see Roan extract his mother's sword from the sheath a guard is holding for him, then turn around and step towards the center of the arena. Several seconds later, in the shot of Lexa right after Clarke's arrival, you can see him in the background unsheathing the sword once again. (00:28:00)
Continuity mistake: When Clark is drawing Lexa, a dot between her eyebrows turns darker and then changes into a gold star. (00:01:40)
Continuity mistake: During the fight between Anya and Clarke in front of the drop ship they are both covered in grime, and after Anya hits Clarke with the log Clarke's face becomes increasingly smeared with blood. Throughout the scene, you can see Clarke's face switch between grimy and bloodied at least a couple times, most noticeably in the shot just after Anya tackles her into the ground and the following one. (00:34:25)
Continuity mistake: During the duel scene Lexa's face gets smeared with black blood following a few hits, but in the shot when she announces "The Queen is dead" right after she kills Nia, Lexa's face is suddenly clean. (00:30:55)
Continuity mistake: During the duel scene, after Lexa smacks Roan flat to the ground, he lands with his right hand right upon one of the swords. In the following shots, the sword changes position and can be seen at various distances further to his right. (00:30:10)
Blood Must Have Blood: Part 2 - S2-E16
Continuity mistake: In the scene when Octavia and Maya enter the mess hall while trying to escape the guards chasing them, you can see Maya is walking in front of Octavia. In the shot immediately after, though, Octavia is the one in front and she is being stopped by a guard pointing a gun at her. In the following shot we are back to Maya walking in front still trying to cross the hall, just as she sees guards appear from around the corner; that is the point when the two turn around, and we are once again presented with the same shot of the guard intercepting Octavia, only from a different angle. (00:26:40)
Contents Under Pressure - S1-E7
Continuity mistake: When Clarke extracts the knife from Finn's chest, suddenly they all get thrown to the ground. Once she stands up again, in the first shot she's holding the knife with the blade pointing behind her, as it was when she extracted it, but in the following shot the blade is pointing forward instead. (00:14:20)
Murphy's Law - S1-E4
Continuity mistake: When Clarke and Finn are undressing in the bunker, right after Clarke takes her shirt off in a closer shot they both have bare shoulders. In the following shot Finn has his shirt on once again before pulling it over his head. (00:39:30)
