When the person tips over in his chair, he ends up with a waste basket on his head. There was no basket on the floor prior to his tipping over.
After the stairs are fixed and Falstaff Pratt confidently walk down them to the basement, as he's walking toward the roller skate on the floor, he changes the length of his steps in order to step on the skate.
Falstaff Pratt is operating a pneumatic drill when the action is stopped and personally-molded ear protection is shown. However, more dangerously, Falstaff was operating the equipment without eye protection. A loud environment affects hearing over time, but a splinter or fragment in the eye can cause blindness immediately. (Granted, eye protection was discussed a bit later in the show.)