
In the text of the statement the verb that is misspelled is: "prueba" (taste). The error is that the person of the verb has been incorrect. Throughout the text the form of "usted" is used while "tú" is the only verb that is wrongly conjugated.
Now it points out some differences between "tú" and "usted":
The difference between "tú" and "usted" depends on the formality. "Tú" is used when talking to friends or relatives (informal) while "usted" is used when talking to older people or a person of high social rank (formal).