Specific Memory Gaps
Specific memory gaps are one form of "memory error." Memory gaps of these kind are fairly common and are caused by many different factors, primarily circumstances of the event, age, and distance in time from the event itself.
A memory gap can be caused by trauma: a car accident can be traumatic to the point of being unable to remember events immediately before and after. Aging, and distance from an event can result in a loss of memories of the actual details of an event.