I did a B737 course at Boeing in 1977 and they definitely showed the film then, it was necessary for Boeing to demonstrate to the FAA that the 737 could be flown by one pilot, with emergencies, if the F/O was incapacitated. The film was done in the SIM.
Suggest you contact Boeing, they may be able to direct you to where you can get a copy. The pilot in the film was one of the Instructor Pilots who worked for Boeing.