While doing some Abbott and Costello searching on the Internet, I came across the following episode of the Abbott and Costello Cartoon on Youtube:
The episode is clearly called "Desert Danger", however on every episode guide that exists on the Internet there is no mention of this episode. There were 156 episodes of the cartoon made and the existance of this one suggest one of two things, There actually are 157 episodes or all the episodes guides have mis-named one of them? If so which one? I have added links to all the episode guides I could find:
If someone has an answer to this mystery please leave a comment to this post as this is the kind of thing that drives me crazy.
The Abbott and Costello Cartoon Show is an American half-hour animated series that aired in syndication from September 9, 1967 to June 1, 1968. Each of the 39 individual episodes consisted of four five-minute cartoons.  The cartoons were created jointly by Hanna-Barbera, RKOand Jomar Productions between 1965 and 1967. The series was syndicated by Gold Key Entertainment and King World Productions.
The primary feature of this cartoon series was the fact that Bud Abbott supplied the voice for his own character. (Because Lou Costello had died in 1959, his character's voice was performed by Stan Irwin). (synopsis from Wikipedia)