They Went That-A-Way & That-A-Way(1978)

The laffs are breaking out in all directions!

Dewey and Wallace are small-town lawmen who are ordered by the governor to go undercover as prison inmates to find out where a gang of thieves have hidden their loot. While they're undercover, however, the governor dies, and because no one else knows about the ruse Dewey and Wallace are stranded in prison.