The phrase "and no mistake" is an idiomatic expression used to emphasize a point or statement. It can be replaced with several synonyms such as "without a doubt," "undeniably," "absolutely," "unequivocally," or "categorically." These synonyms emphasize the certainty of a statement. Alternatively, it can also be substituted with "that's for sure," "indeed," "truly," or "without question," to convey the speaker's confidence in the statement being made. "And no mistake" however, is a catchy phrase that can be used in everyday speech or writing to give emphasis to a point and add some personality to the language used.