The trivia item below may give away important plot points.
When Dr. Heidi is explaining to the group why he lied to them, he says, "The Indian kid got it right," referring to Abed. Shirley quickly corrects him with, "He's half Arabic." and Abed chimes in, "And half Polish." In reality, Danny Pudi, who plays Abed, is half-Indian, half-Polish.