"The Guernsey Literary and Potato Peel Pie Society" is based on the novel of the same name by Mary Ann Shaffer and Annie Barrows, which is a work of historical fiction. While the story features real historical events related to the German occupation of Guernsey during World War II, the characters and the specific plot are fictional. However, the setting and the experiences of the islanders during the war reflect true historical circumstances, blending fact with imaginative storytelling.

"The Guernsey Literary and Potato Peel Pie Society" was not filmed in Guernsey primarily due to logistical challenges and restrictions. Instead, the production took place in various locations in the UK, including London and the nearby Isle of Wight, which provided suitable settings that could replicate the charm of Guernsey. The decision was influenced by factors like budget, accessibility, and the need for specific filming locations that matched the story's aesthetic while accommodating the crew and equipment.