"The two are unrelated. I'm not into turtles or space stuff"

Harry Connick, Jr. is making it clear that he is not interested in either turtles or area things. He is stressing that the 2 topics are unassociated which he has no interest in either of them. This could be translated as an amusing way of revealing his disinterest in the 2 subjects. It could likewise be interpreted as a way of expressing his absence of understanding or understanding of the 2 subjects. He may not recognize with either turtles or area things, or he may simply not have an interest in either of them. Whatever the case, it is clear that Harry Connick, Jr. is not into turtles or space things. He is making it clear that the two subjects are unrelated which he has no interest in either of them.