The Sorting Hat needed more than five minutes to decide whether Peter Pettigrew should be Sorted into Slytherin or Gryffindor. He was, thus, a true Hatstall. It chose Gryffindor. This decision was considered a mistake by many, though the Sorting Hat itself never considered it a mistake afterwards.

Did the Sorting Hat make mistakes?

Rumors have run rampant for years that there are 7 mistakes made by the Sorting Hat in the Harry Potter franchise, but creator J.K. Rowling maintains that the Hat never made a mistake.

Is the Sorting Hat biased?

While competition between Hogwarts Houses can be fierce, the Sorting Hat appears to serve as a neutral party, uninfluenced by petty rivalries, seeking only to put each student where they are most likely to excel.