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In fact, most of the changes found in early Christian manuscripts have nothing to do with theology or ideology. Far and away the most changes are the result of mistakes pure and simple slips of the pen, accidental omissions, inadvertent additions, misspelled words, blunders of one sort or another.

Bart D. Ehrman (2008). “Whose Word is It?: The Story Behind who Changed the New Testament and why”, p.55, A&C Black
In fact, most of the changes found in early Christian manuscripts have nothing to do with theology or ideology. Far and away the most changes are the result of mistakes pure and simple slips of the pen, accidental