Continuity mistake: When Flash plays tag with Faust ("Now you see me, now you don't"), there is a brief shot in which he rushes at Faust - but not inside Hyppolita's palace, but in some high-tech laboratory. Obviously a shot from some earlier series, since the coloring and style are different from the Justice League's.
The Brave and the Bold (1) - S1-E12
Continuity mistake: When the car crashes into the café Flash is at, you see it hit the counter and fall back down, and nothing is on the hood. When Flash asks the guy if he's okay, there's a burger on a pretty flat part of the hood. In the next shot, it's gone, and the hood is completely crumpled up.
Continuity mistake: When Aresia's shown as a child in flashbacks in the ocean she goes from being barefoot to wearing black shoes in several shots.
Legends (1) - S1-E16
Continuity mistake: When we first see Music Master's car, it's mostly in the street. In the next shot, more than half of it is on the sidewalk. And then, when the cops show up, it's nowhere to be seen even though it was parked in front of the stairs.
Injustice For All (1) - S1-E18
Continuity mistake: When Trina runs to her dad, he gets down on two knees. In the next shot, when Superman and Flash arrive, he is seen kneeling on three legs.
Injustice For All (2) - S1-E19
Continuity mistake: When Joker comes down to the basement to kill Batman, he finds the empty titanium restraints still fixed on the post. But when Batman gives him the knock-out punch, the restraints have suddenly disappeared.
Continuity mistake: When the Thanagarian commander addresses the delegates in the locked room, there is a guard standing in front of the door, next to the projection. In the next shot, he has moved to the side by the wall.
Starcrossed: Part III - S2-E26
Continuity mistake: The surveillance video of Hawkgirl talking to the Justice League is different than what we saw in the previous episode. She doesn't move towards Bruce in the video, people are in different positions, and Clark has glasses on in the video.
Chosen answer: In this series, Hal Jordan never became Green Lantern. Kyle Rayner did instead. John Stewart is Rayner's partner and serves as Green Lantern in the Justice League.
MasterOfAll