When rehearsing with an instrumental ensemble in the church, Mary Jones is playing the sackbut (a Baroque precursor to the trombone) and Dr Jones is playing a bass viol (a precursor to the 'cello).
The salmon are delivered to the project in tanks slung under Boeing CH-47 Chinook helicopters. US (military) helicopter manufacturers tend to name aircraft after American Native tribes, in this case the Chinook people of Pacific Northwest region of the United States. However, the Chinook (Oncorhynchus tshawytscha) is also a species of salmon.
When Harriet and Dr Jones are eating at a restaurant for the first time, Dr Jones empties his glass, yet in the next scene the glass is full again. This happens a few times throughout the scene.