Yes, in the 1935 film adaptation of David Copperfield
No
Yes, in the film adaptation of The Lord of the Rings
Yes, in the film adaptation of Gone with the Wind
Answer
Indeed, Walpole did make a cameo appearance in the 1935 film adaptation of David Copperfield. This portrayal marked a milestone in cinematic history, immortalizing Walpole's presence on the silver screen and further cementing his literary legacy.
The Wonderful World of Walpole: A Quiz on Hugh Walpole - English Writer Extraordinaire