When the dog starts digging out the sand covering the Baron; there are a certain number of people on the beach in the background. But on the next immediate cut which is a close-up of Mrs. Topper, the makeup of the background people now changes.
When Marion opens all the jail cells; a crowd of prisoners starts scuffling with the police as Topper starts exiting via the left side of the crowd. But on the next cut; Topper is now exiting via the right side.
When Topper loses control while driving the sports car, we see him in closeup, then in long shot careening up a hill, between trees. It is obvious that it is not Roland Young because he is bald and the stunt driver has dark hair.
In the opening courtroom scene, Marion signs her last name in the note to Topoer as KERBY but all printed outlines of the plot spell it KIRBY.