There's an interesting interview with John Mollo (ANH costume designer) and he revealed a lot of things I didn't know, like the fact that Luke's yellow jacket from the rebel ceremony was an off-the-rack ski jacket and the same jacket (aside from the color) as the one that Ponda Baba wore in the cantina.
The prop gun that Luke has holstered at his leg during the rebel ceremony scene is the exact same gun Leia used in the scene where she is captured by the stormtroopers at the start of the film.
Leia's necklace from the rebel ceremony was also an "off the rack" piece bought at a jewelry store called Lapponia (it was designed by a Finnish artist named Bjorn Weckstrom).
There's a bunch of other trivial bits like that, plus some photos I'd never seen before with Mark Hamill in his Tunisia costume hanging out with Derek Lyons (who played a couple of small parts in ANH). There's also an interview with Lyons, as well as interviews with some other bit-players from ANH.