- The plants' plans for the town, depicted with Deliberately Monochrome paintings.
- To someone with chemistry knowledge, the pollutants. The plants are being poisoned with stuff like dioxin, phenol, vinyl chloride, mercury, arsenic... yikes.
- The music. A couple tracks were re-used from 5th Grade - which were all the dangerous music and the biosphere chambers music. The music that plays around the bottomless pits as well as the room right before the first bottomless pit is also somewhat freaky.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/TheClueFinders6thGradeAdventuresTheEmpireOfThePlantPeople
FollowingNightmare Fuel / The ClueFinders 6th Grade Adventures: The Empire of the Plant People
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