I talked to a baseball card photographer recently and asked him how this could've happened. I thought that maybe the photographer mislabeled the images before handing them in. He agreed, but also added, "usually it's a roster # screw up, the players switched jerseys, the photographer screwed up, or the company did." He also pointed out something that I wouldn't have known, commenting on Jeff Juden's pose with the bat, "well, Jeff with a bat tells me the photographer had no clue."
Jeff Juden is a pitcher posing with a bat. I learned that card companies typically frown on those types of images unless it's a veteran. Somehow, Jeff got one over on this particular photographer. He actually got away with it on another card that same year on a 1991 Line Drive AA card. Perhaps it was the same photographer.