The shrunken U.N. Building/Monolith changes size many times throughout this episode.
The water monster is shown to be frozen before Batman fires his freeze ray at it.
One shot of the East River shows the United Nations building on the right coast, and Queens on the left. Three bridges--the Williamsburg, Manhattan, and Brooklyn--should be visible in the background, but only one is depicted.
For some reason, four members of the Legion Of Doom, who have no superpowers at all, go out to get the Monolith only to be stopped by a powerful lava monster. They instead then create a ploy to lure the Superfriends there when they would have been better off sending out someone like Bizarro or Sinestro.