Kerala book shows frog in place of Gandhi

Mahatma Gandhi is revered as the father of the Indian nation. He has a special place in the Indian polity, with many politicians and social workers using his name and legacy in their actions, and making a name for themselves by called themselves 'Gandhians'. His birthday is celebrated as a National Holiday in India on October the 2nd. So it was a shock and a very surprising thing that school book in one of the states of India showed a frog in a place where Mahatma Gandhi's photo was to be depicted:

Causing extreme embarrassment to Kerala government, a school workbook features the picture of a frog in a chapter on Mahatma Gandhi. The "goof-up" appears in a workbook distributed to students of classes V to IX in Kasargode district of the state. The workbook mentions Gandhi Jayanti and has the picture of a green frog under the heading. Below the picture is a quote by Gandhi on the importance of work.
Education officials were quick to dismiss it as a technical error. They claimed that it happened due to a mistake in handling the printing plates at the press. Officials have also started efforts to collect back the 'erroneous' books so that it can be set right.

Now mistakes happen, but it also seems to be that there was nobody who actually verified the book after it was printed to see whether there was any mistake or not. There would have been somebody whose job it was to verify this, and they must have been goofing off.