Copperhead, Shade, Solomon Grundy and Star Sapphire previously worked together in "Fury" and were described as being from Lex Luthor's old gang. Here the villains are joining Luthor's gang and don't seem to know each other (Shade has to introduce himself).
During the fight Cheetah scratches Batman's face, tears his cowl and shreds his cape. All of that damage vanishes before the end of the battle.
Superman's grip on Ultra-Humanite changes between shots, going from full nelson to around the waist and back.
The word "federal" is misspelled "fedral" on the federal building.