The Scorn of the Star Sapphire! - S3-E5
Continuity mistake: Major Disaster gets a good hit on Green Lantern and smashes him into a wall with some large chunks of ice. Green Lantern leaves a hole in the wall, but none of the wall falls out and there are ice chunks all around him. But when Batman swoops in to get him out of the way, there is no ice there anymore, and suddenly there are several chunks of wall around Green Lantern. (00:12:45)