In the Rap Battle sketch, two extras can be seen breaking character and turning toward the window to conceal laughter when Jordan Peele's "hype man" character screams in the battle leader's face.
In the Hype-Man sketch, the rap battle announcer is played by Lloyd Alqhuist (A.K.A 'EpicLloyd'). Lloyd is one of the two creators of the youtube series 'Epic Rap Battles of History' which Key and Peele have featured on before.
In the Rap Battle sketch, Keegan's character is wearing circular bobbles in his hair, in a 'Snoop Dog' hair style.