Visible crew/equipment: When Charlie practices with Ray placing cards on the car's hood, someone next to Ray is seen reflected on Charlie's sunglasses.
Visible crew/equipment: When Charlie is taking Ray to the bar for his date with Iris, in the mirrored wall behind them you see a lady in a blue shirt motioning for the extras to walk by the camera.
Answer: Susanna was there as well; Charlie just used the "date" as a reason for the three of them to go down for a drink together. He knew Iris wouldn't show up.