IMDB Wrote:
On 8 January 1999, Disney issued a recall of 3.4 million copies of the home video version because two frames included an "objectionable background image", probably inserted without permission during production as an in-joke. The offending frames appear in a scene featuring a pan across an apartment: in one of the apartment windows, a picture of a topless woman can be glimpsed. This scene was intact for the original theatrical release in 1977. However, it was not in the 1992 video version because that was "made from a different print" according to a Disney spokesperson.
I assume some prints had these controversial frames. And the '99 release used one of these prints. I guess there was a LD release along side the VHS release.