2.1.509 Part 1 Section 17.16.5.68, TOC

a.   The standard does not specify behavior when both the \f and \l switches are used.

In Word, if the \f switch is used after the \l switch, the \f switch supersedes the levels specified to include all levels.

b.   The standard says that the \p switch argument is a sequence of characters.

Word only allows a single character in the argument of the \p switch and ignores any additional characters.

c.   The standard states that the \o switch will direct the TOC field to include paragraphs formatted with the specified built-in heading style(s).

Word will include any style whose definition includes an outlineLvl ("[ISO/IEC-29500-1] §17.3.1.20; outlineLvl") paragraph property corresponding to the heading level(s) specified by the \o field argument.

d.   The standard states that the text in the field-argument of the \t switch specifies those styles as a set of comma-separated doublets, with each doublet being a comma-separated set of style name and table of content level.

Word uses the list-separator ("[ISO/IEC-29500-1] §17.16.1; Syntax") between doublets and the two items within the doublet. But the list-separator can be other characters besides a comma.