As observed from an originsl stat published in foreign markets Carl Burgos redrew the arms coming out of the mirror to make them look less monstrous.
Art credits per Nick Caputo and atlastales.com.
Coloring credit per Stan Goldberg.
Final three panels drawn by Joe Maneely, likely due to an editorial change in the ending.
Anti-communism story.
According to atlastales.com, this is Don Heck's first story for Marvel.