Continuity mistake: There's an oscillating fan near the ceiling that alternates between running and not running from one cut to another in one scene.
Continuity mistake: When Miss Lonelyheart brings home a younger man, she slaps him on the left side of his face, but when he leaves and stands outside her door, he rubs the right side as if it hurts.
Continuity mistake: When a man carrying a big block of ice passes by the sculptress's backyard, we see her cat sitting on a chair next to her as she works on her "Hunger" sculpture. Before the jump-cut, the cat is facing toward the man, and after it, it is facing away him when it gets up, turns around, and meows at him.
Continuity mistake: If you look carefully, you can see that the apartments of Miss Lonelyheart and the Thorvalds appear to be ridiculously shallow in depth.
Continuity mistake: In the scene where Lt. Doyle quickly drinks his brandy, he spills a fair bit on the lapel collar of his pale grey suit. He wipes it off and turns to go, but as we see him leaving, the suit suddenly looks quite dry. It could not dry off like that in only a few seconds.
Continuity mistake: When Miss Torso, walks toward her mini stove for the kettle, her hair is in a bun as she walks back to the table and eats and exercises. While James Stewart is on phone with his editor, Miss Torso's hair is suddenly secured in high ponytail hanging down her back as she dances in her apartment.