Topps started using game action pictures on cards in 1971. By 1977 they had become pretty common.
Except for one team.
Take a look a tile of the 1977 Cubs set and count the action pictures.
None. Zero. Zip. Nada.
The 1976 Cubs were not the greatest team ever, but in 162 games, with 75 wins, surely Topps could have found some game action worthy of including in the set.
When I noticed that there were no action shots, I went back through the entire set to see if any other NL team got the same treatment.
Nope. Here's an action card for at least one player from each of the other eleven NL: teams.
So it's just my boys in blue that got the action shaft.