The Justice Society was an unusual choice I think to headline their own digest so soon; the JSA had just wrapped up their run in Adventure Comics so they were homeless at the time--maybe that's why DC felt they needed to slap Superman and Batman on the cover, to help goose the sales a little (I also like Dr. Fate--acting very un-Dr.Fate-like--doing the old hard sell. I guess The Spectre threating to damn kids to hell if they don't buy this digest was considered too harsh).
"The All-Star Super Squad" by Gerry Conway, Ric Estrada, and the late, great Wally Wood. This story is the introduction of Power Girl, and she was off to a great start:
...and in a code-approved comic, no less!
Hard to believe anything could follow that, but DC tried with "5 Drowned Men", a Golden Age tale by Gardner Fox, Irwin Hasen, Joe Kubert, Lee Elias, and Frank Henry
Then we have the mini-classic "Dr.Fate" solo story by Martin Pasko and Walter Simonson that first appeared in DC's First Issue Special title. Too bad Pasko and Simonson didn't get to continue doing Dr.Fate stories--this is an enormously fun adventure, and Simonson's art--even at this early stage in his career--is wonderful and hits exactly the right tone.
We wrap up with a fun 3-page primer about the differences between Earth-1 and Earth-2. I dunno; I know Crisis on Infinite Earths was meant to make stuff easier to follow, but as a kid I didn't have any problem understanding it, and found these little back-story features a lot of fun.