It's hard to tell what Ross might or might not have added to things - especially when a lot of the dialogue that doesn't appear in DC's version of the script but does appear in the novelization also happens to appear on the Fest's 1999 Movie Calendar. And the Fest said all the dialogue appearing on the calendar came from copies of the hoDS and NoDS scripts that they had in their possession in 1998 (which are obviously earlier versions than DC's copies of those scripts that appear in the Movie Book). So, in those instances, we can be sure that at some point along the way the hoDS dialogue on the calendar was part of a version of the script.
One thing that makes it so hard with hoDS is that, while there are earlier versions of the script in circulation in fandom, there seem to have been many different drafts of the hoDS script along the way - more so than with NoDS...
And another thing that's interesting (or some might say frustrating) when it comes to hoDS, unlike when scenes or entire sequences of scenes were dropped from the NoDS script and that was indicated in subsequent versions of the script -
203- 203- 205 OMIT OMIT 205
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- that's not always the case when it comes to some of the scenes that were dropped before they decided on the final draft of the hoDS script. In fact in one draft, there's an indication of scenes omitted, but that indication doesn't appear in subsequent drafts to that draft. Though the nice thing there is that unlike with NoDS where we pretty much have no idea what the omitted scenes consisted of, the scenes that were omitted from the hoDS draft that I'm referring to do actually appear in the version of the hoDS script that appeared in the DS Files books because that version of the script was apparently an earlier draft that contained them (and I'd shared those omitted hoDS scenes in this topic when we came to the section of DC's script where they would have appeared).