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"Judge McCracken" is one of several roles played by an unnamed actor.
He went beyond the instructions of director Kazam, several times putting the gang in real danger, like sending Shaggy and Scooby zooming down into the mine on a runaway car. This shows he was irresponsible and reckless.
Scooby Doo... Mystery Comics (Gold Key Comics)
As the judge, he had Scooby-Doo sign (pawprint) for his inherited mine, and then told him that the fine print said he must occupy the haunted mine until the lost vein of gold was found. This was all a ruse to keep the gang around for the movie. (The Trail of the Wailing Ghost)