Susan: I have decided to put an end to this madness that is ruining all our lives.
Michael: You're going to kill dad?
S9 E1 "Bully For Ben": When Ben hits the punch bag sideways, it's easy to tell that someone is controlling the punch bag as it never slows down.
For the entire first season, the hinges on the front door are on the right and the stairs have a corner at the bottom. However in all seasons after this, the hinges on the front door are on the left and the stairs go straight down to the floor, no corner. (Some sets do sometimes change between the pilot episode and episode 2, but I have never seen something change after a whole season.)