Revealing mistakes: With the switch to more expensive color film in 1954, there was a mandate to shoot no more new effects scenes than absolutely necessary. Most Superman-in-flight footage was filmed right-to-left. When the plot unavoidably required Superman to fly in the opposite direction, the footage was "flipped," as can be detected by the reversal of the "S" chest emblem. Another explanation is that George Reeves' "body pan' was attached to a pole that was blocked from view by his body. Unfortunately it was attached on only on his right side. If he had to be shown flying in the opposite direction the film had to be reversed. This not only occurred in the colour episodes, but the black and white ones as well.
Crew or equipment visible: In some shots where Superman used the springboard to leap out of frame, the tip of the springboard would bounce back up and appear at the very bottom of the frame.
Continuity: Many scenes in the color seasons show Clark Kent leaving an office in the Daily Planet building to transform into Superman. When leaving, Kent often wears or grabs his hat, but whenever he approaches the storeroom to change costume, he doesn't have the hat with him.