Well spotted, didn't notice that. The wheels spin backwards briefly before he puts the brakes on.
The other thing I notice is that if you watch the the tracks that the car leaves as it slides down the hill the reflection from the lights shows that it really is sheet ice underneath ... the snow is a very unstable layer on top of the ice ... doomed! We do rather worse in the UK for this kind of problem. In properly cold countries the packed snow gives some amount of grip (with the right tyres). In this country we get rain when it's initially just above freezing ... temperature drops a few degrees and that freezes to ice and then a layer of snow on top. If it wasn't salted before the snowfall you end up with this treacherous result. UK commonly has daytime melting and night-time re-freeze leading to very unpredictable surfaces.