Goofs

When the characters are on the platform, it moves downwards not as fast as it did before.

at 28:11 the Trimagasi's right hand is on Goreng body but in the next shot his left hand is, and again in the next shot his right hand is on Goreng's body.

at 45:35 Imoguiri turn her head to the left side but in next shot her head is on the right side and again she turn her head to the left side, in the next shot her head is on front and she turn it on the left again! it means she turned her head to the left 3 time without turning to the right.

There are 335 not 333 levels if you count Level 0 and the dark bottom as a level. There are 665 people in the hole, not 666 as it is claimed because the child was alone and there was no indication of another person was there with her before.

However, level 0 isn't counted because it's not part of the installation (the "cells") where prisoners are held, that starts at level 1. The "dark bottom" isn't counted for the same reason; there are no prisoners (cell) there.

The child being alone is an assumption. Just because another person isn't show with the child it doesn't mean they don't/didn't exist. Most of the other 600+ aren't shown but it is accepted that they exist. Even if this logic is rejected, the 666 number isn't presented as fact; it's just something a character says.