When Richard came face to face with Jake, he and Allison walked right on visible stage marks on the floor.
At approximately 27 mins in the show, Alison and Richard are standing in the lobby of the Snow Globe Inn. During the wide shot you can clearly see tape on the floor, which is used as position makers for the actors.
When Mrs.Jones walks into the cabin. You are able to see a crew member's boot as she walks in, under the table.