With GCD 5, it is simple to apply the spatial coherence filter and Bayesian updating described in Wheaton et al. (2010) and described in this lecture topic from the GCD Workshop. This video shows the necessary steps to take when using the Change Detection panel:

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References:

• Wheaton JM, Brasington J, Darby SE and Sear D. 2010. Accounting for Uncertainty in DEMs from Repeat Topographic Surveys: Improved Sediment Budgets. Earth Surface Processes and Landforms. 35 (2): 136-156. DOI: 10.1002/esp.1886.
• Wheaton JM. 2008. Uncertainty in Morphological Sediment Budgeting of Rivers. Unpublished PhD Thesis, University of Southampton, Southampton, 412 pp. Chapters 4 & 5.