Visible crew/equipment: When Albert and his friends are in front of Doris' house they are singing a song about going to the park. As they are finishing the song and leaving to go to the park, you can see the reflection of the microphone in the window of Doris' house.
Visible crew/equipment: When Doris is sitting on the steps at the party, Fat Albert walks up and tries to convince her to dance. In one of the shots, the boom mike is casting a shadow to Doris' left.
Answer: He has said in many interviews that they were based on his friends growing up. The characters of Bill and his little brother Russell, were Bill Cosby and his brother Russell. Thou the adventures were exaggerated, the characterizations were real.