When Frank and the Damerons are discussing how to cover up the accident, Tad holds a business card, then drops it on the table. On the cut to a closeup, he drops the card on the table again.
In the closing scene, Henry Dameron writes Perry a cheque and hands it to him. There is then an exchange between the two, during which Perry is seen in close-up. Then, in a wider-angle shot, Perry turns and picks up the cheque from Dameron's desk before tearing it in half, but it was last seen being held in Perry's hands.
When Frank Thatcher is driving his 1959 Lincoln and is nodding off just before he runs down the pedestrian, the gear shift for the automatic transmission is way up in view over the dashboard, because the car is still in park even though he is supposedly driving down the road.
After Paul is knocked out in Frank Thatcher's apartment, the next scene begins with a record player playing a record. The tone arm of the player gets to the end of the record, resets, then comes back down about a quarter of the way into the record. In reality, the tone arm would play at the beginning of the record after resetting.
When the police enter the apartment and find Paul Drake and the dead body, there is a record playing on the stereo. As the phonograph arm reaches the end of the record, it resets itself and plays the record again. However, the balancing arm of a record changer normally would do this only if the arm was raised and moved all the way to the right. In the position the balancing arm is in, the changer would have stopped at the end of the record and shut the player off.