Lapsus

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Lapsus is an involuntary mistake made while writing or speaking. According to Freud, in his early psychoanalytic theory it represents a missed deed that hides an unconscious desire.

In literature there are a number of different lapsus depending on the mode of correspondence:

Lapsus Linguae (pl. same): slip of the tongue.
Lapsus Calami: slip of the pen. With the variation of Lapsus Clavis: slip of the typewriting
Lapsus Manu: slip of the hand. Similar to Lapsus Calami.
Lapsus Memoriae: slip of memory.

[edit] Types of Slips of the Tongue

Slips can happen on any level:

Syntactic - is instead of was.
Phrasal slips of tongue - I'll explain this tornado later.
Lexical/semantic - moon full instead of full moon.
Morphological level - workings paper
Phonological (sound slips) - snow flurries becoming flow snurries

Additionally, each of these three levels of error may take various forms:

Anticipations: Where an early output item is corrupted by an element belonging to a later one. Thus "reading list" - "leading list".
Perseverations: Where a later output item is corrupted by an element belonging to an earlier one. Thus "waking rabbits" - "waking wabbits".
Deletions: Where an output element is somehow totally lost. Thus "same state" - "same sate".
Shift: Moving a letter. Thus "black foxes" - "back floxes".
Haplologies: half one word and half the other. Thus "stummy" instead of "stomach or tummy". (Smith, 2003)