Booshman said:
Ah, so dropping in the footage as is, but within the black border of the original film. So the sides drop out during the added footage?
Yes. The added footage accounts for only a small portion of the runtime, so this way you can watch the whole film in widescreen, obviate the laborious process of panning and scanning, and avoid heavy cropping. While I understand that some might not like this approach, it definitely has its merits.