The hanging white flowers on Michaela's wedding arch are white wisteria, first brought to America from Japan and China in 1816. They do not grow in Colorado, but were likely brought aboard the train with Elizabeth Quinn.
The unspoken disease give to Marjorie by her errant husband Everett was most likely gonorrhea.
The actors who played Loren and Marjorie were married off-screen.
The gown was from Paris, France.
Loren is Sully's former father-in-law.