Clever special effects from The Howling Man, a 1960 episode of The Twilight Zone

OK, want to see a neat special effect?
This is a scene from The Howling Man, a 1960 episode of The Twilight Zone.
Check out how this character (the devil in the guise of an imprisoned man) seems to morph. pic.twitter.com/ERRl0SJ8z0

— foone (@Foone) December 5, 2018

The next special effect is a little less subtle, but it's still a neat trick.
The character finishes turning into the devil as he walks down a hallway, and this time it's not just a colored-lighting trick. pic.twitter.com/YIayzH42WR

— foone (@Foone) December 5, 2018

(Tricks explained in the thread.)

Bonus:

Elspeth Dudgeon undergoes an astonishing transformation (with the aid of special makeup and camera filters) in SH! THE OCTOPUS (1937). pic.twitter.com/Y4A1TXvG3q

— The Nitrate Before Xmas (@NitrateDiva) December 5, 2018