All stories originally appeared in 1955-1964.
Located on the inside front cover.
Credits from the reprint in World of Archie Double Digest (Archie, 2010 series) #73.
In the flashbacks, Fred and Mary are drawn closer to the way they look in the regular Archie comics rather than the versions that appeared in "Little Archie."
This story is credited as being from Archie Giant Series Magazine (Archie, 1954 series) #10 but it doesn't appear in that issue. Verified with hard copy of Archie Giant Series Magazine #10.
This is located on the inner backcover.