Most of us in the 80s taped Star Wars off network TV (including ads) - they used to show it once a year. And for some reason you could see the masks around the TIE fighters against the star background. When I was visiting my parents for Christmas last year we watched the Ewok Adventure that we had taped on VHS and the most interesting parts were the ads!
> 1985: The original Star Wars film was re-released on VHS, LaserDisc, and Capacitance Electronic Disc (CED) with an improved audio mix. The LaserDisc and CED sped the film up by 3% to fit onto a single disc.[10][b]
> 1993: The original trilogy was released on LaserDisc as "The Definitive Collection". With the exception of a new THX audio mix, scratch and dirt removal, and color balance changes, it matched the original theatrical releases.[10]
> 1995: The original trilogy was re-released on VHS with THX audio, advertised as the final release of the theatrical versions.[12][13][14]
I'm guessing the '93 LaserDisc (like the '95 VHS) lacked those obvious matting artifacts on some of the space shots, but the '85 release still had them.