The more an object pops out, the more likely it will get crosstalk, as the separation between the left/right image on that object will be very large. If the contrast is very high on the popped out object, it will be even more likely to have cross talk. The amount of cross talk can vary, from none, to a little, to a lot, depending on a variety of factors, such as the model of TV, the model of glasses, and the distance you are from the TV. The reason it happens is because the glasses have to flicker at exactly the right time for only the correct image to enter the correct lens. Chances are, the timing will be pretty darn close, but there is a margin of error, allowing partial leaking of the incorrect image into each lens. Usually, however, it's pretty close, and you'll still see the proper depth, you'll just see a halo/glow around objects that pop out very far or are extremely far away. If you want to reduce these artifacts, try changing your TV to 48Hz mode in 3D. Most people say this almost entirely eliminates crosstalk, but it is slightly more flickery as well, which could cause eye strain. I've found that turning out any lights or other screens helps make the flicker less noticeable.
Most theaters don't have this issue because they use polarized glasses instead of the active shutter glasses that work with these TVs. Some TVs also use polarized glasses, but those TVs output half the resolution and some people can get eye strain from the polarization filter as well.