Book:Raymond M. Smullyan/Set Theory and the Continuum Problem/Revised Edition/Errata

Exercise $5.6$: $B - \paren {A - B} = \O$
Chapter $2$: Some Basics of Class-Set Theory:

Class which has Injection to Subclass of Well-Orderable Class is Well-Orderable
Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text I$ -- Superinduction and Well Ordering: $\S 1$ Introduction to well ordering: Proposition $1.2$

Condition on Proper Lower Sections for Total Ordering to be Well-Ordering
Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text I$ -- Superinduction and Well Ordering: $\S 1$ Introduction to well ordering: Exercise $1.2$

Choice Function for Set implies Choice Function for Union of Set
Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text I$ -- Superinduction and Well Ordering: $\S 4$ Well ordering and choice: Exercise $4.3$