The criminal Barns says to Lois that the vault is airtight and she has only about 2 minutes of air, this is not true. As most vaults are airtight there is also enough oxygen to last several hours or even days depending on how many people are trapped and the size of the vault. Even with as many people locked in with Lois, they should still have had several hours.
When Superman appears at the Auction, the scene of him jumping down onto the balcony is the same footage used in the previous episode when he confronts Lex at his Penthouse.
When the invisible gunmen exit Fort Metropolis, the shoot the police cars many time evident by the sparks yet the bullets don't leave holes in any of the vehicles.
When the invisible men were shooting at the cops in front of the bank, their guns were also invisible until Superman sprinkled the phosphorus on them. There's no reason the guns should have been invisible. Only the special suits were.
All the images of Superman at the"Superman Day" event show the traditional drawn version of him, with a curled lock of hair on the middle of his forehead, but the live character has his hair combed back.