Emma (Willa Fitzgerald) says "I'll be right back". This is a direct reference to the original Scream (1996) movie "horror movie lore" - whoever says this, won't be back.
On Emma's (Willa Fitzgerald) shelf a Harley Quinn "POP" doll was shown during her call with Will (Connor Weil). Harley Quinn is a DC comics character. Bex Taylor-Klaus, who plays Audrey, also starred in Arrow (2012), a show based on DC comics character Green Arrow.