The subtitles in PG are cropped at the bottom and there were never any official 16mm releases, so the subs weren't added to the print, they were copied onto it along with the rest of the picture. Period.

It's quite possible that there were different versions of the subs as well as the credits but at first glance these seem the same to me, only a bit underexposed (like the rest of the picture).

Anyway, here's a part of the video from Baltimore, stabilized and with the shake on the subtitles tracked a transferred onto a red square in blue field, to make it more visible.

Now, the tracking was of course affected slightly by the picture constantly going darker and brighter but I think it still pretty conclusively shows that there was shake on the subs during the Baltimore screening.