When Roger visits Abigail at her camp her air bed is supported on a frame that holds it about 8 inches off the ground. Later, during the rainstorm, the bed is flat on the ground so it can be washed into the lake.
Just after helping Easy gracefully exit the lodge due to her inadvertently unzipped dress, Roger attempts re-zip the back of Easy's dress. Just prior to the moment Easy turns her back to hide Roger's hands from view, it is obvious that Roger grasps the end of his tie to attach it to the zipper.
When Abigail cuts the cast off Roger's arm with the circular saw, she is holding and running the saw backwards.
John McGiver's character William Cadwalader mentions his wife makes him wear a hair piece, but he is not wearing a wedding ring.