At around 6:30, when Dean Pelton is making a list of great elements, the first is "Luis Guzman is in it". Then the number 2 is shown (blank). When the number 3 comes up, the accent mark on "...Guzmán" (1st element) appears.
A microphone is seen when Annie is talking about having an epiphany.
The character played by Brady Novak is identified as "Eugene Robinson" of the Greendale Board of Directors, but later the character's name is given as Richie Countee and he is described as being on the school board.