When Jean-Louis Trintignant accepts to climb into bed with Françoise Fabian, he motions for her to pass him the blanket, extending his right hand holding a lit cigarette. The next shot from the side shows him grasping the blanket with a cigarette-free right hand.
In the second Mass scene, a boy in the congregation can be seen staring directly at the camera.
After the night spent at François' student apartment, Jean-Louis Trintignant and Françoise go to church and later talk. For a moment, the boom mic drops into view from the top.