Near the end, when the heroes get into the Ark Roamer, Samuel is sitting behind Ruth and Adam behind Jonah. But when the vehicle is in motion and shown from behind, Samuel and Adam have switched places.
In the beginning of the episode when Ruth drives off to follow the cougar she spotted there is a shot of her from the side. Out of focus in the background can be seen cars and equipment, probably picnic tables and such from the campground in the state park where much of the series was filmed.