Lyndie Greenwood (Sonya) and Jessica Camacho (Rachel) both appeared on Sleepy Hollow (2013). They played Jenny Mills and Sophie Foster respectively.
When birkoff say about Michael's hand going " idol hands" on you, it a reference joke to the movie "Idols Hands " which stars Devin Sawa. Devin Sawa plays series reoccurring and main character Owen Eilliot/ Sam.