Cellbound (1955)

A prisoner serving a 500 year stretch at Sing Song prison spends 20 years digging a tunnel under the wall. Escaping with his bag of disguises he intends to see the world but ends up instead inside the warden's television set. So, to keep from being caught, he has to use his disguises and act out programs such as a western, a boxing match and a ragtime band (but not the horse race) as the Warden keeps changing the channel.