This document discusses different types of speech errors known as slips of the tongue. It describes common errors like spoonerisms where initial consonants are transposed, malapropisms involving similar sounding words, anticipations where a word's initial sound is replaced, and blends where two words fuse into one. Research suggests speech is pre-planned at an unconscious level and errors arise from how linguistic knowledge is stored and retrieved in the brain when we speak. Common causes of errors include fatigue, alcohol, or nervousness disrupting ideal speech delivery.