List all the films that Karl Berr starred in and rated as PG.
film refers to title; rated as PG refers to rating = 'PG'
SELECT T3.title FROM actor AS T1 INNER JOIN film_actor AS T2 ON T1.actor_id = T2.actor_id INNER JOIN film AS T3 ON T2.film_id = T3.film_id WHERE T1.first_name = 'KARL' AND T1.last_name = 'BERRY' AND T3.rating = 'PG'