When carbon dating Aquaman's communicator, Batman is there. Yet, both Batman and Robin are stuck in Rome at the time of Caesar and are not saved by Superman until after the carbon dating is completed.
The Romans confiscate Batman and Robin's utility belts before consigning them to the arena, and we see them without the belts twice. However, they are both wearing their belts when Superman joins them, even though he had no opportunity to return the belts to them.
Wonder Woman is one of the six heroes Green Lantern envelops with his power ring to travel back to Sutter's Mill, but when the heroes ambush the villains there, she has been replaced by Apache Chief.
Just before his jousting match with Sinestro, Green Lantern has three arms.
Lex Luthor issues an order to Grodd with Captain Cold's voice.