Throughout time, the study of typographical errors has been approached from a variety of fields, such as bibliography, textual criticism, publishing, metalexicography, psycholinguistics and natural language processing (NLP). However, typographical errors are inherent in written texts, and there is no multidisciplinary and allencompassing method for their treatment. For that reason, we present a theoretical review of typographical errors and their categorisation, especially from the perspective of psycholinguistics and NLP. On the one hand, some of the most thorough studies from the XX century onwards have been conducted in those two fields. On the other hand, there are remarkable similarities, regarding both the conclusions reached (e.g. the low frequency of errors in the first letter of words) and the limitations encountered (e.g. ambiguity in error categorisation). Thus, our starting point will be the theoretical distinction between motoric or execution errors (mistypings) and orthographic or cognitive errors (misspellings). Moreover, we will analyse the commonalities between the abovementioned disciplines when it comes to identifying the wrong operations (omission, insertion, substitution, and transposition) behind those phenomena. Finally, we will confirm that sometimes execution errors and competence errors cannot be distinguished in the practice of writing. [ABSTRACT FROM AUTHOR]