Injustice For All (2) - S1-E19
Other mistake: Unless he escaped prison, it makes no sense for Copperhead to be in the police van with the other Secret Society members. You can see him sitting there across from Solomon Grundy and The Shade.
Other mistake: When Lex finally manages to open Batman's utility belt and spills out its contents, we see several hand grenades dropping out of the pouches. However, these grenades are standard military egg grenades, and with their size and bulk they should have bulged out the square pouches in which they had been kept - if they had ever fitted inside in the first place.
Other mistake: Aquaman is animated with two hands and no hook for a single shot while swimming underwater at the end battle in the Arctic.
Other mistake: At the beginning, when Java is filming, you can see that the image on the lens is meant to be a reflection or a mirror image, as it should be. It appears that Mason's left hand is on fire when it's actually his right hand. However, the "23" on the building isn't a reverse image.
The Brave and the Bold (1) - S1-E12
Other mistake: Flash brags about having beaten Gorilla Grodd to two girls at the beginning of the episode, but then later is surprised by talking gorillas and seemingly meets Grodd for the first time.
Suggested correction: Flash never talks about Grodd. He's telling a story about Solomon Grundy.