During the conversation between Leon and John on John's deck, the water level and position of the pitcher changes.
When Nik is at the police station explaining what happened the night he picked up Valerie, we see it as he is describing it - and as she gets into his truck, you can hear the door slam before it is even shut.
When Sonja is in the car park, at about 54' at the bottom of the frame you can see the dolly track complete with sandbag, wedges and Mafer clamp.
When Sonja and Leon are in bed, the crew is reflected in a large standing mirror.