I recall that the White Album had four 8x10 portraits of the Beatles, suitable for framing; that McCartney’s Wings over America had a full-size poster of the band; Elton John’s Captain Fantastic included two booklets, one with lyrics and one with reprints of news clippings and photos of Elton’s and Bernie’s history; and that Jim Steinman’s Bad for Good even included a 7" EP with the music he wanted to include in the album but that wouldn’t fit on the 12" LP.
As Lynn mentioned, most albums didn’t have such things, but for those that did, the extra goodies were real treats.