Concrete high-profile example: in "Surely You're Joking, Mr. Feynman!", Feynman told of a ball which, in a Brazilian college-level physics book, was described a

Concrete high-profile example: in "Surely You're Joking, Mr. Feynman!", Feynman told of a ball which, in a Brazilian college-level physics book, was described as having a 40% higher acceleration that it would actually have in practice. Turns out that the author had done a thought experiment but neglected to factor in the rotational inertia.