During this pod cast on knowledge and approval and mistake, we discussed the following: (i) the general concept of "knowledge and approval" and what amounts to such; (ii) the case of Hastilow v. Stobie; (iii) how to ordinarily establish "knowledge and approval", and what might be needed in special circumstances; (iv) the cases of Crerar v. Crerar, Re Phelan and Fulton v. Andrew; and (v) words appearing in a will by inadvertence.