- Dawson Casting: Frequently done with regards to 17-year-old Alan for understandable reasons. Peter Firth, the originator of the role, was twenty-four years old when the film version starring him was released. Averted by the 2007 West End revival (you know, the one that got the Moral Guardians up in arms).
- Hey, It's That Guy!: The recent revival featured Harry Potter being psychoanalyzed by his uncle, Vernon Dursley.