792 cards in this set, including a few different subsets.
The player cards have an inset closeup photo of the player on the bottom left and the team nickname displayed vertically on the left, above the photo. The player's name and position(s) appear below the main photo. The photos are a mixture of the standard poses and there are some action photos.
Each of the 26 teams has a Team Leaders card which indicates the leader in Batting Average and Earned Run Average. But beware because the card displays only qualified players (enough at bats or innings pitched) and so the Royals have Larry Gura and a 4.90 era on the front of theirs and the Reds have Ron Oester batting only .264.
Each of the 26 teams also has a card for their Manager which is usually a closeup of him looking past the camera, smiling or talking.
There are 8 League Leaders cards for 8 different stats that display the leader for both the American League and National League on each.
There's also 22 All-Star cards which is essentially a second card for each player. Some Topps sets display the "All-Star" banner on the regular player card but this set has a separate card indicating the league and the position of the player.
AL and NL Active Career Leaders for 7 different stats highlight the players who are active and leading that league in a particular stat. I believe that this is the only time that this subset has been used.
#470 Nolan Ryan
#251 Tony Gwynn
#596 Ryne Sandberg
#300 Pete Rose
#400 Cal Ripken (All-Star)