This sort of personal experience indicates the need for a Personal Software Process where you do a code or design review looking for the sort of stupid mistakes that you personally make all the time. The list must be updated as you change your mistake pattern, possibly reducing the about of code review time needed. Mistakes that are introduced but not found during a test typically cause a problem later. These mistakes are called defects. So make no design or coding mistakes if you want to get your product out of the door the fastest.
Many television sets advertise comb filters nowadays.
A comb filter is a filter that has multiple passbands and stopbands, giving a frequency response graph that looks like a comb. It is implemented by combining a delay line with a summing amplifier. The comb filter in a TV set adds a second amplifier that has one inverting input. In TV lingo, the third dimension is time. Another source of artifacts arises from images that contain rapid motion.