Technically, ghosting is crosstalk, but not all crosstalk has to result in ghosting. Ghosting refers to the crosstalk that is perceptible (can be seen). Crosstalk may be so low as to be invisible to the naked eye but still measurable by instruments that are sensitive enough.Here's a ghosting torture test that I created in Vegas Pro.
You may be shocked to see how much ghosting your display exhibits. My LG passive display is the best I own in terms of ghosting, but it flunks this test, as do all my other displays. I'll run it again when I get the BenQ W7000 DLP (IF I get the BenQ W7000
This is not a "fair" or "real world" test. The only displays that can ace this test are DLPs. I'm not aware of anything else that can do it except for HMDs (head mounted displays), which by their very nature isolate the left/right views completely, and are therefore 100% crosstalk free. They're like the old ViewMasters we all know about from when we were kids. Although it's technically possible to "bake" ghosting into S3D images, it's just not done. Take your worst examples of what you believe to be ghosting "caused" by content and watch it on a DLP. Unless it's caused by bad glasses timing, you won't see it. Or, if you have access to one of the Sony HMDs, try it there. You won't see it. Or split the stereo image of my torture test disc with something like MVCtoAVI. You'll find that one side of the "stereo" image is completely black. There is no ghosting baked into it.
Content does not cause ghosting; it reveals your display's inability to prevent it. Wide divergence of objects within the stereo frame, especially if they're high contrast, are especially good at revealing your display's weakness in this regard, but that doesn't mean the content is "responsible" for the ghosting. It does mean that those of us who create 3D have to be aware of the problem and try to avoid it. I think that was probably one of the big reasons that James Cameron shot Avatar the way he did. He was using a first gen Panasonic 50" 3D plasma display to edit, and he had to be keenly aware of ghosting. I think that's why we see so much soft focus backgrounds and misty blue scenes, which tend to hide ghosting. It's also why he was so "conservative" with the depth. It also helped to hide crosstalk. Avatar is one of the worst titles you can use to try to spot crosstalk in commercial 3D. He also varies the convergence point in almost every shot (creating massive numbers of edge violations along the way, which I'm OK with), but making for some very easy 3D viewing that almost never stresses the viewer due to widely divergent objects. My LG passive display is great for watching 3D titles. I take the glasses off and watch for how the director and editor chose to deal with such issues.