Make your dungeon exits harder to leave than to enter!
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This is very cool. I’m going to have a gundum outside of my dungeon hole in the ground that only attacks stuff that comes out. Swatted adventurer’s scatter the landscape 
a formative movie for me, specifically about dungeons, is the Pat Boone Journey to the Center of the Earth. loved that movie as a kid, and watching as an adult it feels like its IN THE MIX for influences for D&D. … anyway … it has a great dungeon exit (and entrance!). the characters are at shores of the great ocean at the center of the earth, and use this giant brazier as a shield as a volcano erupts and shoots them out of the mountain. i turned that into one of my favorite dungeon exit tropes-- take the PCs very far away, transport them to another adventure type location, NOT back where they came from. (this didn’t happen in the movie, but it COULD have!)
(sidebar: look at me holding my tongue about the title’s mixed metaphor)