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The mechanic that I use the most is the group action one--the character with the lowest stat (or riskiest position) rolls, everyone else automatically succeeds unless they choose to fail. Really elegant and quick and great, especially since PbtA often falters a bit when it comes to multiple characters doing the same thing. I've also used 'tell a story' a few times when things are quiet but I don't want to introduce anything heavy, so I'll just give players the option of telling a quick story and give them +1 forward or let them mark XP depending on how it goes. The other mechanic that I liked but haven't had a chance to use elsewhere is dividing a one-shot into distinct sections, which is very smart and dramatic and good. I also greatly appreciated having a pic of each dinosaur, with a human for scale, along with instincts and moves and so on. That combined with the locations + prompts made running it a breeze.