After Thelma Wilkins leaves Mannix' office, she is shown driving down a street where she passes an intersection with a sign prominently advertising the "Shaver Clinic." The shot changes to a closeup of her in her car noticing that two men are following her, then an exterior shot shows her driving passed that same intersection with the same clinic sign, traveling in the same direction, before she executes an evasive maneuver.
At the 10 minute mark, Roger is following Mannix through the LA streets. Mannix turns into an alley & quickly makes a U-Turn to confront Roger who is tailing him. When Mannix turns into the alley there is a auto repair shop that is closed. But the next shot when Mannix confronts Roger, the garage to the auto repair shop is open.
At around 10 minutes in alley where Manix turns around to confront the tail following him.As Manix goes to pull away two men on the garage look more like crew members than auto mechanics by the way they are dressed.
Also across the street a man in a flannel shirt is visibly wearing earphones.