When still "unconscious" Dolores grabs hold of Dr. Hfuhruhurr's belt [with her LEFT hand] and a nurse walks in on them, Dr. Hfuhruhurr covers by incorrectly stating that the grip strength in her RIGHT arm is much better (lifting her left arm), but the left is still useless (lifting her right arm).
The third time Dr. Hfuhruhurr climbs out of the elevator (when it's too low instead of too high), he has his satchel. A moment later, when he opens the door to his hotel room, the satchel is gone.
Fran's (the prostitute) accent changes between scenes while signing "Duke of Earl"
The painting is torn before the cat scratches it.
Part of the movie is set in Vienna, but all the cars have license plates from Graz, 200 kilometers away.
The Mercedes driven by Dr. Hfuhruhurr is an American model which is revealed by the type of its headlights.