Jonathan hands the pistol to the inspector twice.
As Jennifer, stefanie powers keeps her fingernails rather short. In the close-up of Jonathan and Jennifer holding a picture of two men, the fingernails are considerably longer.
A luxury hotel would have had a reliable car that the Harts could have borrowed.
The picnic basket would have been heavy with all of the very important lunch items that Max listed, yet Robert Wagner carelessly and effortlessly tosses it in the back seat.
Powers and Wagner carelessly leave the doors of the borrowed car open when they abandon it, with the driver's door actually obstructing the flow of traffic.