Elseworld: Transplants the standard P&F formula into the prehistoric era.
Framing Device: Throughout the episode, we shift to creators Dan Povenmire and Jeff "Swampy" Marsh discussing the episode to explain something going on. It is done in low-budget photo animation since filming it in live-action would not be cheap.
Race Lift: Or species lift in this case. Carl the Intern becomes a hyperactive monkey named Gnarl.
Reality Has No Subtitles: With a few exceptions, most of the dialogue is told in "cave talk" gibberish. But the formula should be familiar enough to fans to understand what's going on.