His Royal Slyness on AllMovie

Harold Lloyd stars in this tale of mistaken identity. A industrious young book salesman (Lloyd) switches places with a prince (Gaylord Lloyd, in real life, Harold's brother), who wants to stay in the U.S. The young man is quite unaccustomed to the court protocol, but he warms to the Princess (Mildred Davis) whose hand he must win. It's not much of a contest -- his rival (Harry Pollard) is a notorious drunk -- but complications arise when the real Prince returns home, having been cast aside by his gold-digging girlfriend. It takes a good dose of American ingenuity and a revolution, but all finally ends well. Notably, this two-reeler was the last made before Lloyd's disabling accident in which his hand was blown apart by a prop bomb.