It is expected that children increasingly learn to identify errors throughout their schooling process and even before it. As a further step, however, some scholars have suggested how a culture of error should be implemented in the classroom for the student to be able not only to locate errors but also, and above all, to learn from them. Yet the various proposals aimed at generating a culture of error in the classroom keep regarding error as all those responses and reactions that are not considered as true or correct in each specific case, thereby not realizing that many of these alleged errors are really anomalies with very different characteristics and consequences despite their seeming resemblance. In this paper, I rely on Ludwig Wittgenstein's "On Certainty" to clarify the difference between errors and anomalies. Subsequently, I provide guidelines that may be adapted by each teacher to her students' needs and development level in order to foster a culture of error that begins by distinguishing error from anomaly, which constitutes a practical as well as conceptual necessity particularly in Child and Primary Education, as it is just then when anomalies most frequently arise in the form of questions and answers.