Good job. (Though I've read on forums that there was SOME superimposed text mention of DTS? I didn't see JP in the theater, so I don't know for sure. Better not to guess what it may have said, or at what point it appeared...)
As I said in the main DTS thead, the regular, post-JP "This theatre features DTS Digital Sound" version would be great to preserve. I've always loved that bass ending with that weird noise as the words slide in.
As a kid (b. 1987), my local premium-sound venues all seemed to be DTS; I saw The Digital Experience, and in THX-certified auditoriums I saw Grand and Tex, and occasionally Broadway (I remember that one on Titanic, and possibly the Star Wars SE's). I don't think I ever saw a Dolby Digital trailer until 1999. And I never found myself in an SDDS theater, so I didn't see those until the Internet.
Boris, I don't recall you ever answering if you have that later standard Digital Experience on disc - do you? I believe it was a separate disc, just as the trailer came by itself.