When Stephanie left Ellie due to their little argument, you can see Stephanie's flower in her right ear before leaving. A man saw her biking with no flower present in her ear until Stephanie reached the road with the flower transferring from her right to her left ear.
During the scene, when Ellie and Stephanie are first drinking in the bar, the two young Argentinian men buy the girls a shot each. Stephanie is shown drinking almost all of her shot, however on the next shot she still has a full shot glass and is preparing herself to drink it.