While trying to cook his dinner, Archie knocks an open bottle of salad dressing off the kitchen table. A few moments later, it's back on the table again, miraculously not having spilled a drop. Evidently, Carroll O'Connor knocked it over unintentionally.
When Archie's steak is burning, the smoke is coming from somewhere below the stovetop, between it and the camera.
When Archie thinks there's an ice cream truck outside, he yells "Good Humor man?" toward the backyard instead of toward the street in front of the house.