Captain Cold freezes the SuperFriends in a block of ice mid-battle. In the next scene, the misshapen block becomes smooth, and the SuperFriends are suddenly lined up in a neat little row.
After Batman, Superman, Flash, and Green Lantern all grow to 100 feet tall, they all take off from The Hall Of Justice to stop the villains. Flash is suddenly replaced by Robin.
The Washington Monument is approximately 555 feet high. Yet, when 100 foot tall Bizarro karate chops it, it appears to be only about ten feet taller than he is.
When Captain Cold freezes the Superfriends, only ten of the eleven are in the block of ice. Aquaman is missing, yet he appears later after they free themselves from the clutches of Saturn.
When the Superfriends are frozen in the block of ice, the S on Superman's costume is backwards.
How does Giant Batman manage to travel to London to stop Giant Toy Man? Batman cannot fly, and the growth ray could not have been able to grow the Bat Jet for him to fit into.
Samurai's black hair is colored brown in one scene.
When Superman first attacks the giant-sized Legionnaires of Doom, Batman's chest symbol are reversed - a yellow bat on a black background.