In the dinner scene near the end, first the roast is on the table, then someone brings it in.
Young Man wakes up barefoot following his abduction, but after his forced injection he's wearing black shoes. When he reawakens, he's barefoot once more.
When Young Man pretends to be unconscious, he lies face down on the mattress with his head facing left. When the camera angle changes, he's facing right.
(at around 18 mins) Brown shoes appear on Young Man's feet after he's shocked by the cattle prod.
(at around 55 mins) Dr. Volk plays a phonograph record, setting the needle to the record before turning the switch that starts up the turntable The gritty sounds of the record are heard before the turntable starts revolving.