The psychotherapist will often draw attention to seemingly irreverent or trivial actions or non actions. While you may be content with a perfectly rational explanation - that this is just part of the ordinary forgettings, accidents, coincidences and seemingly random happenings of life - the therapist will often look for deeper layers of meaning.
Psychotherapists generally hold that our actions and non actions have complex layers of meaning corresponding to layers of conscious and unconscious motivations and intentions. Like dreams the therapist will consider the possibility that such events are important communications from the unconscious. The exploration or such events often proves very fruitful.