LOL, as I recall the cards had to be inserted in their proper order. Probably took him days just to punch the cards. Sounds like a good way to learn some new cuss words.
My first wife was a keypunch operator for an insurance company.
One stack of cards was the program that had to be loaded into the computer that then operated on the second stack of cards: the data.
To cut down on the GIGO factor; new data was first placed on a card by a KP operator. That card was placed in a machine which compared the data to the exact same data (in theory) that the Verifier would type into her (mostly) machine.
If the two items matched; the card was kept.
I guess the idea was that it would be difficult for two people to make the same error entering the data. Any discrepancy would show that one or the other had made a typo.
That’s why we punched line numbers into columns 73-80.