"Innerspace" is among a few of Spielberg's produced films that got early letterboxed releases, along with "The Color Purple" which was always letterbox-only.

widescreen.org's favorite unmatted gaffes to cite were the boom mic in "The Princess Bride" (which they also knew was digitally erased in later video issues) and John Cleese's "nude scene" in "A Fish Called Wanda" which obviously spoiled the gag. The one I'm surprised isn't mentioned nearly as often is "Dr. Strangelove" which, despite Kubrick's approval of the transfer, shows things that clearly weren't intended to be projected like the notorious A-bomb shot (only Kong and the A-bomb were full-frame, while the rear projection was already matted.

("Lolita" on LD reportedly has a similar "multi-aspect" presentation which, unlike "Dr. Strangelove", was not presented this way on DVD. I have the LD of "A Clockwork Orange" which was said to have variable aspect ratios, but it's a straight-up 1.66:1 transfer that simply employs windowboxing for the titles and the newspaper towards the end)

I spotted a VHS of "Manhattan" some years ago with the standard pan-and-scan disclaimer (the printing was somewhere around 1996) but I have no idea if it was a misprint or done with the hope that Woody wouldn't have noticed (he did sue a TV station once for showing it in pan-and-scan). The 1984 LD has the letterboxing disclaimer on the front mentioning "grey bars" but they looked as close to black as grey can get.

Somewhere in the early 90's, possibly influenced by how Super 35 films were transferred, 1.85:1 films would occasionally crop just the close-ups (Robert Altman's "The Player" as a noted example) while transferring the rest open matte.