1. Price tags being sticked on the walls or doors
When we have a new product in hand, we must be removing the price tag. Some of the price tags will be sticky and since it is sticky there is a tendency that we will stick it somewhere on the wall or door.
The tags could have been made non sticky to prevent this action.
2. When there are multiple elevators in a building, it is likely that users will push buttons of all the elevators to come to their floor resulting wastage of energy and causing inconvenience to other users.
Design could have been in such a way that there is a single control switch for all the lifts and the control switch decides which elevator is near to that floor and brings that elevator to the particular floor.