There are various places in the spec where parentheses are unnecessarily bolded. I've marked each with an asterisk:
7.1.12.1 / step 6 : *(DIGIT ZERO)
7.1.12.1 / step 7 : *(FULL STOP*)
7.1.12.1 / step 9 : *(PLUS SIGN*)
9.2.12 / step 28.f.i.6 : InitializeBinding(m, initialValue*)
18.2.5 / step 5 : *(HYPHEN-MINUS*)
18.2.5 / step 6 : *(PLUS SIGN*) *(HYPHEN-MINUS*)
20.1.3.5 / step 8.a : *(HYPHEN-MINUS*)
20.1.3.5 / step 12.c.iii : *(FULL STOP*)
20.1.3.5 / step 12.c.iv.1 : *(PLUS SIGN*)
20.1.3.5 / step 12.c.v.1 : *(HYPHEN-MINUS*)
20.1.3.5 / step 12.c.vii : *(LATIN SMALL LETTER E*)
20.1.3.5 / step 14.a : *(FULL STOP*)
20.1.3.5 / step 15.a : *(DIGIT ZERO*) *(FULL STOP*) *(DIGIT ZERO*)
21.1.3.15 / step 6 : RegExpCreate(regexp, undefined*)
21.2.5.2 / step 6 : RegExpBuiltinExec(R, S*)
21.2.5.2.1 / step 7 : RegExpBuiltinExec(R, S*)
21.2.5.9 / step 7 : Set(rx, "lastIndex", 0, true*)
21.2.5.9 / step 11 : Set(rx, "lastIndex", previousLastIndex, true*)
24.3.2 / Note 4 : ToString*(number*)
Annex C / bullet 11 : Function.prototype.call*)
fixed in rev36 editor's draft
in rev36