One of my faves: Journey to the Center of the Earth (1959) but its got some errors:
Saknussems plumb bob. How did it survive the lava & wouldn't it melt?. Surely the writing would burn off? (in the book, its just a bit of parchment).
At the end, the find the volcanic chimney & Pat Boone exclaims 'We can climb out'...Err, despite his enthusiasm, if the are about 3900 miles down that'll take a while, plus food/water/where to sleep?. And in the final eruption, although we don't know how long it took, after moments they can see light at the top of the shaft....despite being 3900 miles down. The lava must have pushed them at over 1000mph!.
Arne Saknussem's skeleton - to eject the plumbob would require an eruption, so why is his skeleton and indeed, Atlantis, still intact?.
'Estimated depth 129km, limestone formation continues' says James Mason. Limestones are formed mainly in shallow tropical seas....that's one really deep sea!.
'We are now in a stupendous deposit of cinnabar!'....is another line. Cinnabar is mercury-bearing, probably not very healthy.
Salt deposits miles down?
'A forest of mushrooms, to think they grew without sun this far under the Earth'...mushrooms don't generally need sunlight to grow.
At the centre of the Earth: 'A field of force that snatches gold away'....Pure gold is magnetically inert.