In the first three slides (Top 1-3), it shows Tom Robinson, minding his own business, as the mocking bird is. Later, he gets wrongfully convicted of raping Bob Ewell's daughter, Mayella. Then in the third scene, it shows that Tom Robinson had to suffer the consequences not only because he was convicted of rape, but because he was black.
In the last three slides (Bottom 4-6), it shows once again, Tom Robinson and the mockingbird, minding their own business, but this time, it tells a story of the mockingbird. The second slide shows a man being irritated by a bird outside chirping very loud and obnoxious like. He suspects it is the mockingbird doing this, so he follows through with his suspicion and kills the mockingbird, even though it wasn't him! The man feels as if he has done something right, just as the policemen felt when they killed Tom.
This little comic symbolizes why Harper Lee titled her book "To Kill a Mockingbird", because both Tom Robinson and a the mockingbird have many similarities, not only this one. This only shows one of them, being the most significant in my opinion.