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A general description is here.
The DESCRIPTION file of a package can specify an 'OS_type' field as either 'unix' or 'windows' to confine installation to that OS type.
QuartzThe Mac OS quartz() device draws contiguous lines much faster.
R CMD check checks for possible check directories in the sources -- in mid-2008 there were about 20 examples on CRAN.
file.path() did not work correctly in 2.7.0 if the components had different encodings.
is() was wrong for some S3 class objects with class forof length greater than one.
undoc() / codoc() where not checking all S4 methods in some cases.