I linked to this page because it had some really nice stuff in the pre-film areas. I have since found that there are some simple mistakes in the 30's, 40's and 50's.
Along with typographical errors these are some of the seriously inaccurate facts. For example, MGM is listed as the creators of Porky Pig, Bugs Bunny, and Foghorn Leghorn. Anyone will recognize this as incorrect. And regarding Yogi Bear and Boo-Boo, they were originally segments on the 1958 HUCKLEBERRY HOUND SHOW. They did not debut in 1959. That was QUICK DRAW MCGRAW. Lastly, Format produced THE ALVIN SHOW (not ALVIN AND THE CHIPMUNKS) in 1961, and it ran on CBS not NBC. The NBC show was the revival in the 1980s as ALVIN AND THE CHIPMUNKS produced through Ruby-Spears and others then.