We all know that Roast Turkey is the canonical dish in both countries. Cornbread figures prominently in the Southern US.
What are the other significant differences?
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From my experience, there are no major differences between Canadian and Northern American dishes. We have most of the normal Turkey (or Goose/Duck), yams, potatoes, stuffing/dressing, pies etc... There are probably more differences with in the United States itself (southern vs northern), for example the cornbread you mentioned.
In other words, when I watch American Thanksgiving food/cooking show specials, the large majority of the dishes are very familiar and relevant to my experiences up here.
I would suggest that most variations come from families' countries of origin/culture.. For example, my mom usually cooked some special Chinese dishes, but clearly that isn't a Canadian thing. (Also, Southern influence, coastal influence, Latin influence etc..)