Which of these would likely require serious error notification?

The scenario that would likely require serious error notification pertains to the detection of an erroneous entry. In the context of NCIC operations, maintaining accurate and reliable data is crucial for law enforcement and public safety. An erroneous entry can lead to significant consequences, such as misidentifying individuals, wrongful arrests, or failure to locate a missing person. Therefore, when an error is detected, it necessitates immediate notification and rectification to ensure the integrity of the data and the safety of the public.

In contrast, the other scenarios, such as minor report updates, verifications of matched suspects, and new missing person cases, do not inherently signal a major issue or error in the database. While they may require attention and processing, they do not involve the fundamental reliability of data in the same way that an erroneous entry does. Thus, they wouldn't trigger the same level of urgency for serious error notification as an erroneous entry would.