I have to say, V, that I absolutely did not think the movie did anything remotely like what you describe. I thought it painted a great picture of Canadians, being the only ones to take in the Americans after all those others who turned them away.
Yes, perhaps the movie diminished Canada's involvement in the creation of the plan. I confess I don't know the real story. And I have to also add that TV news shows are also continuing this deception because TV news magazine programs are going along with what was presented in the movie: the CIA came up with the idea, got Canada to go along, and gave all the credit to Canada where it has remained until the truth was made public in 1997.
But even then, I have seen nothing at all derogatory about Canada. At all. Nothing but great praise, in fact.