|Jason tells Connie about his brother Jerry and how he died tragically in the Vietnam war.
The date on which the news of Jerry's death reached the Whittakers (November 12, 1971) was the same day that the deadline was set for the withdrawal of 45,000 troops from Vietnam.
When young Jason and Jerry are talking about the cabin on Lake Michigan, Jason asks Jerry if they can go across the lake into Canada. Lake Michigan doesn't border Canada. Later, Plato actually goes across the lake into Canada.
This was probably the most avoidable goof there was on the show and I can't believe it. I would think everyone would know that Lake Michigan is the one great lake that dosen't border Canada. If they had said any of the other 4 it would have not been a goof but they had to use the one that didn't.