The two boys are wanting to explore the others life and they look so much alike that that nobody would know that they were not the right person. So while everybody thinks that the boys are lying how would they know?
Guards, get them!
If you have grown up in a town that is literally known for its poreness then it would be quite a change to go from barely getting any food to getting to much. It would also be a big change to go from royalty to really, really, really pore.
Serving a Punishment
Now part of that confusion comes in now when the drunk father of the peasant boy (Tom Canty) is chasing his "son" through a big mob . He does not know this is the Prince of Whales so he thinks it is his son trying to run away.
Miles Hendon comes home expecting a warm welcome but instead is angrily kicked out by his brother. He finds out that the girl that he was going to marry had been forced to marry his brother. now that he was there his brother pretended that it was not him so he was thrown in jail.
Now that they are in jail they meet two pretty young ladies who were thrown in jail due to their beliefs. The Prince of Whales thought that this was very, very wrong so he declared that when he was king he would end all of this nonsense.
It is Coronation Day and the "Prince" is about to be crowned when all the sudden the real prince comes in and claims that he is the real Prince of Whales so they ask him where the royal seal is because of course only the real price would know where it is and he gives them the answer. Now they believe him.