In the final shot of the Society, Toyman's mask, which was broken earlier, is suddenly intact (and broken again in "Alive!").
Luthor wears a pair of metal gloves as he jumps over the balcony, but in the next shot he is barehanded again, before they reappear a few shots later as he confronts Grodd.
When the Society divide between Luthor and Grodd, they're revealed to be roughly split in half, but when Killer Frost freezes Grodd's followers, they are only twelve.
Luthor wouldn't have survived punches from a gorilla like Grodd as a mere impact from a gorilla can kill a human.