I'll second that on the critters. There's a herd of bison along that route that like to hang out on the road and they're basically impossible to see at any reasonable distance in the headlights. Do your driving along that section in the daylight only, unless you have the worlds only buffalo-proof grill.
In November the daylight hours are getting pretty short, so plan accordingly. I've driven the section from Whitehorse to Anchorage in the winter, and generally it's pretty well maintained. That said, glare ice can be a problem and the amount of traffic along the road slows WAY down in the winter (even if the drivers don't

). There are several long sections without any cell phone coverage (and most US cell phones don't work at all along most of the Yukon section of the Alcan) so help might be quite a while off if you turn turtle in a ditch. Pack warm clothes for everyone (as in ice-fishing warm) and make sure you bring along a basic survival kit, including good sleeping bags if you've got them.
BTW, there is a fantastic indoor pool/playground at the Canada Games Center in Whitehorse that stays open year-round. They have a kiddy pool that's kept quite warm and varies from about knee-deep to chest-deep (to an adult) along with a "lazy river" and a pretty decent water slide. The same complex also has a large indoor hottub and sauna, along with several ice-skating rinks and an indoor playground with play equipment for younger kids.
It's quite affordable and usually open pretty late at night, well worth a visit if you hit Whitehorse at any reasonable hour. We make the drive up from Haines a couple times a winter and always stop there, it's a big hit with the kids.