TechniqueValuationVideo located
Terminal value is usually most of the answer, and most of the risk
Check what share of the value is terminal and what multiple the terminal assumptions imply; those two checks catch most broken DCFs.
Any DCF review, any interview follow-up on the terminal growth rate, and any model where the answer seems too sensitive to the last year.
From Session 9: Terminal Value · Aswath Damodaran (NYU Stern)