Ford Pines reminisces about Glass Shard Beach in an entry in Journal 3 for the Island Head Beast. He mentions that Lake Gravity Falls is his favorite place because it reminds him of his childhood in Glass Shard Beach.
During the end credits of "Not What He Seems," Stan and Ford Pines are shown as children on a swing set by the shoreline. Stan Pines also has a book on his bookshelf labeled "Glass Shard Beach High Yearbook."
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