In part 4, 10000-4, section 5.13.1.1, there is a list, which in the .pdf renders as a lettered list,
a)
b)
c)
...
but in the online reference, renders as a numbered list
1.
2.
3.
This is mostly "who cares" except that there are references to the list items, such as in f), where it says, "... described in (c) above...", which in the online reference probably means (3).

It would be nice if both representations of the spec used the same list element identifier to avoid issues like this.