Dorothy Wiley films four letters - a letter from her friend, a letter from worms, a letter from bugs, and a letter from her son. She and Bob and Diane Nelson whistle popular favorite classics for the soundtrack.
The film by Brakhage commonly referred to as "Wecht" does indeed exist. It doesn't have a titlecard at the head, and the leader of the original is labeled "Portrait" in Stan's handwriting, so I'm not sure where the 'Wecht' title comes from.
Delia Peletier has been paid to have a child for a wealthy man who wants an heir. She has the baby and turns it over to her "employer," but subsequently decides she wants the child back.
Doc Saxon and his gang rob the Crown City bank but are double-crossed by Carrasco, a Mexican bandit, who steals the gold and leaves Doc and Donovan with nothing.
After a peaceful sailboat ride, four young people, including rich kid Bill, Joe, Fred and Jane, knock on the door of a secluded villa after their dune buggy runs out of gas.