Other mistake: When David takes a book from the bookshelf and opens it, a small piece of paper falls to the floor. Neither he, Ozzie nor Harriet notices it.
The Adventures of Ozzie & Harriet (1952)
1 mistake in The Poet
Starring: Harriet Hilliard, Ricky Nelson, David Nelson, Ozzie Nelson
Trivia: In the later seasons, almost every scene taking place at the Dobson and Kelly law office or in the Emporium or other local business is preceded by the same clip of a downtown street showing "First Bank" and a passing bus.