5150
I watched this movie tonight and noticed a terrific coincidence. When Mr. Matuschek (who just returned from a stay in the hospital after a suicide attempt) comes back to the shop on Christmas Eve, there's a shot of the cash register reading 51.50, followed by a close-up of Matuschek's face.
Today in California, the 5150 code allows for a person deemed to be an immediate threat to themselves to be involuntarily confined to a mental health facility or hospital.