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Here's Hewitt's answer from the Instructor's Manual:
The main reason for serving potatoes wrapped in aluminum foil
is to increase the time that the potatoes remain hot after being
removed from the oven. Heat transfer by radiation is minimized
as radiation from the potatoes is internally reflected, and heat
transfer by convection is minimized as circulating air cannot make
contact with the shielded potatoes.
The foil also serves to retain moisture.
[Grandmother] cut the end of the ham because her roaster
was too small to cook it in one piece.