As the Weeping Somnambulist approaches Ganymede, the star field behind the Jovian moon is accurate - to the moon's right, the belt, sword and shield of Orion; and the star clusters of the Hyades and Pleiades in Taurus, are all clearly visible.
The pan of lasagna that Alex hands Amos is actually a real pan made for brownies called the Bakers Edge Brownie Pan and was developed to give every brownie in the pan two edges - for those that love edges on their brownies.
The Purple Heart Gunny Bobbie wears is actually a combination of the ribbon portion from the Marine Corps Good Conduct Medal and Purple Heart pendant.
"Somnambulist" means "sleepwalker".
"Looking a gift horse in the mouth" means showing undue concern over the quality of a gift. A young horse is a good gift, an old horse is a worthless gift. Often the surest way to check the age of a horse is by looking at the teeth. When a horse gets old its gums shrink, making the teeth look longer. Humans experience the same thing - hence "long in the tooth" means rather old.