This issue has variants.
Mislabeled #497 on cover. From Bob Rozakis, DC production manager at the time: "The price box was picked up from the ADVENTURE COMICS DIGEST. As I recall, we told the printer to strip in the price from ADVENTURE and they took the entire box." (via e-mail, January 1, 2011.)
Inside front cover. Table of contents.
"The Flaming Doom" and "The Nightmare Menace" printed as one long story.
combined with "The Day the Metal Men Melted" into one long story.
inside back cover