"Nigel, David and Derek haven't seen the film," Rob Reiner said Thursday before unveiling the first trailer for his mockumentary sequel Spinal Tap II: The End Continues during Collider's Directors on Director panel at Comic-Con. Spinal Tap II has Christopher Guest (Nigel Tufnel), Michael McKean (David St. Hubbins) and Harry Shearer (Derek Smalls) back as legendary heavy metal band Spinal Tap. [...]