Pickup truck in scene as Elizabeth rides up the hill.
When Marjorie is writing in her diary about the Virginian being the one, she , in cursive, writes the word "to" when she should have written "Too" to describe how she felt about the Virginian .
When Sheriff Abbott knocks on the door of the Hammond house to check on Marjorie, the second time he knocks you hear 5 knocks, but he only actually knocks 4 times.
About 52 minutes into the episode, Elizabeth has a conversation with Trampas in front of the ranch then rides up the road on her horse. In plain view to the right of the dirt road is a 60s pickup truck;
When Bob Foley is talking to Mrs Hammonds outside the ranch house a flashing red light (quiet on the set) can be seen reflected in a window.