I thought there was a simpler explanation for her getting in the wrong cab. I assumed he called one on Hailo, hence was looking at his phone while waiting as it tells you the reg no and how close it is. Then he saw it had arrived, called her over, and she got into the wrong one. He tells her no it is this one and off they go. Surprisingly to my mind Torrilla pic suggests the cab took her to ? her hotel and he then got a private car home; I'd have assumed without that pic that the cab took them both to his home.