There are cuts between extreme close ups of props and details (the envelope, the photograph, the lighter etc), shots of actors, mostly mid shots and close-ups, and wide shots of the entire scene, as well as birds-eye-view shots. Obviously the scene was filmed multiple times from different angles, including a wide shot from far away, over the shoulder shots, and clean front on shots of the actors. The editing cuts elegantly between them to tellthe story, for example, when the actor goes to put his cigarette out on the bull’s head, we see his body move forward in a mid shot and notice a slight extension of the arm and then we see a close up shot of his hand putting out the cigarette on the book stop. This is clean editing with close attention to continuity, so that the story moves smoothly and aids in the experience of the story as any discontinuity problems make it obvious to the viewer that the story is not real. There are several shots in which the camera moves, pans or tilts, this as been done with the camera when filming, not during editing.
As for audio, several sounds have been recorded outside of the filming of the scene and added in during editing, such as the sound of vomiting, some dialogue (or possibly even all of it) hand washing and the fly buzzing. There are also foley sounds that were probably recorded off screen and added in afterwards, such as the creaking floorboards and footsteps, the squeaky chair, the click of the gun and the bullet, the swing of the fan blades, the sliding of the gun across the floor, even the sliding of the paper across the desk, all of which have been added in to increase the tension of the scene.
When people are nervous they become acutely aware of the sounds and movements around them. This has been recreated in the scene through sounds and also the video cuts which zoom in on details that are not necessary for the plot but develop the tension; such as, the lighter on the desk where the quick cut is aided by the loud noise of the lighter hitting the desk. There are also atmosphere sounds, such as the cricket chirping which gives a sense of the heat and the time of day, in this instance, night.