Wikipedia page on Babe Ruth.
When the boys lose the ball over the fence and it is captured by the beast they have reason to be worried! A ball signed by Babe Ruth today would be worth between $4000 and $15,000!!!!
During the movie, the boys refer to Babe Ruth as:
The Sultan of Swat
The Great Bambino
The Colossus of Clout
The King of Crash
The Titan of Terror
But his real name was George Herman Ruth.