I believe the surprisingly excellent Trog mask was actually a scavenged ape head from 2001: A SPACE ODYSSEY.
And for many, many years TROG was about your only chance to see the terrific stop motion dinosaur footage animated by Willis O'Brien and Ray Harryhausen for Irwin Allen's ANIMAL WORLD (1957). The original film was cut up to be used as stock footage and is now considered lost. Fortunately the entire dinosaur sequence is included as a bonus on the DVD of O'Brien's THE BLACK SCORPION.
And there's that Major Matt Mason Space Crawler!
The strength of 20 demons?
Why, that almost
twice the strength of 10 demons!
It baffles science!