Evidently the reason some memory leaks from Roger Lamb’s blog didn’t appear in my SPDisposeCheck test have to do with some offending sample code being optimized out when compiled to release mode. When compiling to debug all the offending samples are identified by SPDisposeCheck. Note the differences identified in Reflector.
Release Version:

Screen clipping taken: 3/20/2009, 2:32 PM
Debug Version:

Screen clipping taken: 3/20/2009, 2:33 PM
Thanks Matt Ranlett and Paul Andrew for solving the mystery.
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March 20, 2009 at 2:25 pm
[...] when calling GetCustomListTemplates method when creating a custom list from a ListTemplate. Mystery Solved! (SPDisposeCheck Missing Memory Leaks?) [...]