Right after the car junkyard fight, Nico chases the "fourth man". On the next cut, the "fourth man" flees on his motorbike with his helmet put on, which he clearly had no time to do.
When "Cupcake" slits his throat there's no blood, even after Nico grabs and holds him when Nico and Cupcake are on the ground, Nico has no visible blood anywhere near his own neck or on his t-shirt. Nico just has a small patch of blood on his arm.
Shortly after 'Cupcake' kills himself, Nico is searching his pockets for his phone. 'Cupcake' is seen blinking.
When Laura and Tom meet to talk, and they switch between English and Spanish in order to keep things from Serena, Laura asks Tom, "Do you know how I know when you're lying?" She stops and says "lying" in Spanish; however, she says "entiendo," which means "I understand" or "I get it." The word for lying is "mentiras."