At around 28 mins, Emily is about to leave in a rather new BMW. When she pulls away from the guy and accelerate pretty fast, she doesn't wear the seat belt. A modern car like that would have a warning when the driver doesn't connect the seat belt, but no sound is heard.
When Emily buys the flat screen, the credit card reader responds "accepted". Credit card readers respond "approved" not accepted.
@ around 18 minutes during the opening dummy shoppers scene as Emily turns to leave one of the extras can be seen mouthing dialogue, but no audio can be heard from her.
When Emily first goes to the Dummy Shopper meeting she's asked, who gave her the number, by Khalil. She tells him it was Javier. Khalil then calls Javier to confirm it.
Later on while working together, Javier asks Emily if she texted the number, which he should know she did from the call he received.