[old_tv_nut]

Any image that follows the main image on the right could loosely be called a ghost.

An overshoot is a following transient in the signal the opposite polarity of the main signal. It is possible for some circuits to produce a transient before the main signal, which is called a preshoot. Generally, if the transient is the same polarity as the main signal, it is called a smear.

TV sets generally use narrow overshoots and preshoots to "sharpen" or "peak" the picture. The one you are seeing is way too wide and too big to be pleasant.
Deliberate overshoots are relatively easy to generate in the video circuits. Peaking coils (in various places) and RC circuits involving small capacitors in the video amplifier cathode circuit may be used for this. A simple sharpness control may use a small capacitor and variable resistor in the video output cathode circuit.

Preshoots are harder to generate, because you can't generate negative time delay. You need a "non-minimum phase" circuit that delays the main signal a little bit. The IF alignment can do this, but it will not be adjustable by the user. TVs for many years used a fixed pre-shoot produced by the IF with a (possibly adjustable) overshoot generated in the video circuits.

Towards the end of analog design, video ICs became complex enough to generate symmetrical preshoots and overshoots in the best sets. Before that, only studio monitors had this capability. This was called "aperture correction" if it was in a studio camera, because it compensated for the shape of the scanning spot. In this case, the signals were produced by a tapped video delay line rather than an IF phase response. The aperture correction name stuck when it was incorporated in video monitors.