Slurred speech, scrawled handwriting, textual typos -- all manifestations of uncoordinated communication. Analog things fail in analog ways, digital things in digital ways. Extending a phoneeeeme = analog failure. Swapping two lettres = digital failure.
However, swapping, repeating, or omitting words are "semantically close" operations in any form of communication. Why? Because the failure is occurring at a more abstract level -- grammar -- instead of at the physical level of producing the communication.