Zoom feature reverts but not the anamorphic ratio.
Exactly, the DVD player setting for "TV Display Type" will not reset when you just change discs, or even if you turn off the player. You need to reset it manually.
Watching it on a 4:3 TV, if the DVD player was set to Anamorphic (or "Wide," as seen below):
The DVD of
The Little Mermaid will seem to be fullscreen:
Whereas if the TV Display Type setting of the DVD is on 4:3 Letterbox ("LB" below):
Then the DVD will appear in its actual 1.78:1 aspect ratio:
I have a feeling that's the case here, av_phile1. I can't confirm it, since I only have my copy as reference, but like I said, I haven't come across any fullscreen release of
The Little Mermaid in any region.