They unveil the statue of Luis Guzman in this episode, but it was clearly visible in the previous episode, "Social Psychology."
During Britta's trial there are several posters visible in the background with the image of the Greendale Human Being mascot. However, Pierce and Dean Pelton do not create the mascot until "Football, Feminism and You". (#1.6).
When Annie tells Pierce "That's 'She'll Be Coming Around the Mountain'!" Pierce replies "I know!", but his mouth does not move.