Mischianza '77 mix-up?

[Alain Champlain]

In the first paragraph of Mason & Dixon, the date of the 'farewell Ball' is
given as '77. The notes I've found on this book point to articles where the
date is given as '78, but I haven't seen any mention of the error: am I
missing something? It seems strange to open on the error (rather like
Nabokov's Ada), but stranger still that I've found no mention of it -- or
at least not yet.

Simple error? Help?
(New here, many thanks)
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