Special Guest Stars Gwyneth Paltrow as Holly Holliday Kristin Chenoweth as April Rhodes Guest Stars Amber Riley as Mercedes Jones Heather Morris as Brittany Pierce Mark Salling as Noah 'Puck' Puckerman Dianna Agron as Quinn Fabray Harry Shum, Jr. as Mike Chang Lauren Potter as Becky Jackson Chace Crawford as Biff McIntosh Co Starring Keith Pillow as Scientist Ratidzo Mambo as Teacher Uncredited Ashley Drayton as Spirit - Professional Roller Skater Evlin Lake as Dancer