These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In the stop-motion Hansel and Gretel: An Opera Fantasy, the siblings hear an ominous chorus ("Children, children, are you not afraid?"), then they see something moving through the trees, then they see glimmering eyes on a tree (really a birch tree), a willow stump grinning at them, a will'-o-the-wisp (Gretel hoped it was a real lantern and real people who can help them), and then Gretel sees ghosts ("shadowy women") coming towards them.
In the Cannon Movie Tales version, as Hansel and Gretel got lost deep into the woods, they hear mock laughter and then an eerie shriek. They hear their names whisper in the dark as they sit near a camp fire.
In the Humperdinck's opera, when the kids were calling out, voices answer back.
Hansel:WHO'S THEREEEEE?? Echo: You there! There!
Gretel: Is someone there? Echo: Where? Here!
The Korean film:
Tastes Like Diabetes - The house is made to be like this. It is, after all, conceived from the children's minds.