When Steve returns from Norcross's country house, Carlos is waiting for him outside the hotel in a spotless suit. When Carlos takes the boy into Victoria's room, a large stain appears on the suit's right lapel. It remains there until they go to the house in the country where Glenn is hiding. The stain disappears when Carlos goes to make a telephone call but reappears when he returns to the house.
After shooting at the intruders at Glenn Ames' house, Carlos tucks the pistol into the left side of his belt. When the policeman relieves him of it, he takes it from the right side.
Victoria is wearing a set of earrings when she and Steve go to Norcross's house in the country. Later on when Carlos calls on her on the hotel, she is in exactly the same outfit with the same earrings but with the addition of a three-string pearl necklace.
When Victoria arrives at Glenn's house, the sun is from the left of the screen. When she steps through the doorway, the shot is from the other direction but the sun is still from the left.
When Steve and Victoria are searching for her brother using just a candle for light, a shadow of the candle and candlestick is cast on the walls behind them - an impossibility. The shadow is being made by a moving spot light.