Six Hours to Lose(1947)

Original title: Six heures à perdre

A traveller is stuck in an unknown town because his connecting train will only arrive in six hours. He decides to kill time by taking a stroll. He is not prepared to get confused with somebody else. In fact the citizens are eagerly awaiting the visit of a famous man and the clueless traveller is his doppelgänger. Soon he experiences what that means.