I recognized those film clips. As I remember, everything was wet on packed slush/ice probably above freezing temperatures. These conditions are common in Seattle/Portland, and as many "skilled" snow/ice drivers from other areas find out, almost impossible to drive on. However, these drivers in the films WERE morons for even trying to get around on that stuff, esp when Seattle/Portland are built on hills, not much flat land around. Many local residents do know how to drive on snow and ice, as we have a very large percentage of drivers who have years of experience driving to the nearby mountains for both day and night skiing.
Speaking about GTV6's, even with snow tires, with and without cables, they were not good in these typical conditions. I also concluded it was the weight distribution. You needed to put a few sandbags in the trunk. I usually used about 4-6. That worked.