When Tom Benton Pours His Own "Whiskey" into the Mug he Clearly Filled it 3/4ths Full and has the Mug in his Right Hand. When Lucas Enters the Saloon and calls his name he's just getting ready to take a swig and a half a second later when the camera goes back to Benton the Mug is Now clearly in his Left Hand and is 2/3rds Empty.
In the saloon Akins shoots the tops off six whiskey bottles sitting on a shelf behind the bar. But afterwards there are no bullet holes in the wall behind the bottles.