Being winter after Daylight Savings, at 10:28, the sky turned dark so fast that in one shot, it was white behind Patrick and the next, it's dark. So, a light thunderstorm was added into the sound mix in order to sell the sky going dark so fast.
43:36 The foam prop brick's paint started peeling off and the crew didn't have any more clean bricks. So, you can see the foam spray across the air every time it's swung.
At 43:12, actor Leo Giannopoulos was actually punched across the face.
For the opening bench scene, the crew had to wait for many civilians to walk by until it was clear to shoot. At one point, a man walking his dog passed by, but when he glanced back and saw the camera, he approached it while loudly bouncing his ball. He looked straight into the camera while he did it, angering the cinematographer to the point she cursed him out. The sound mixer was recording, so it's on tape.