In the long shot when the principals go in to dinner, the butler is seen closing the door. The next shot, a medium, shows the butler closing the door again.
George Brent rings a doorbell at street level, but when he steps through the door into his friend's apartment, they are on an upper floor.
Towards the end of the film, when Dr. Bailey attacks Nick and the two briefly fight, it's very obvious that the people seen fighting are stunt doubles. Nick's stunt double doesn't even have the same hair color.