What's the difference between schizo-affective disorder and schizotypal personality disorder?

Big - some overlap: Schizoaffective disorder is a severe disorder involving recurring episodes of psychosis and mood problems. This can include hallucinations, delusions, disorganized thinking along with mood symptoms including depression, mania, or mixed. Schizotypal personality is less about episodes and more about a life-long maladaptive pattern, involving social isolation and a tendency to have magical thinking.

Psychosis vs bizarre: Schizoaffective DO is a combination of psychosis (hallucinations) and bipolar disorder (extreme mood swings). Schzotypal refers to eccentricities of thought and action, bizarre appearance, being unkempt, uncomfortable in interpersonal relationships, and superstitiousness.