In 'The Colored Cartoon' Lehman analyzes the depiction of black people in classic animated cartoons. His study is interesting and insightful, if a little shallow, mainly because of the paucity of source material, as only a few cartoons feature black-face gags or black characters. Unfortunately his book has numerous flaws.
First, Lehman forgets to describe the tradition of black representation the animated cartoons fall in, assuming that most readers will know Uncle Tom, the minstrel heritage and its associated music. Moreover he overplays the role of black representation in the animated cartoon, especially when placing Bugs Bunny in a black tradition. Because he anachronistically attributes bebop influences to the rabbit's character, his argumentation is very weak to say the least.
Likewise, Lehman suggests that Donald Duck's role as a bad soldier is rooted in a black representation tradition, as if it were not possible for white people to be bad soldiers! Several 1930's Laurel & Hardy films defy that statement.
But Lehman's biggest flaw is that he ignores all instances of cannibals in animated cartoons. Cannibals were the most common and most backward representations of black people, but Lehman sticks to Afro-American representations, only.
This is a major omission, especially when Lehman describes the Betty Boop cartoon 'I'll Be Glad When You're Dead You Rascal You' (1932). Lehman praises it as one of the cartoons to feature real black entertainers, in this case Louis Armstrong. But he fails to notice that in this cartoon Louis Armstrong and his band are directly linked to most backward images of black cannibals, thus degrading the entertainer and his musicians severely.
I suspect that the cannibals had a more devastating influence on black representation in film than all the Mammies and Sambos Lehman raves against.