I didn't think to check for the trailers via a pop-up menu as they were presented on the main feature discs! That's nice to know - but I really dislike those type of "menus" for such items as it makes them very easy to miss!The Blu-ray sets are indeed, massive improvements over their DVD counterparts!
It should be noted that the 2nd and 3rd BDs in each set do include a Trailer for their respective films, which can be accessed via the Pop Up Menu. Also worth noting, is THE MUMMY'S CURSE (1944) Trailer, although not on a very nice looking print, is from the original theatrical release, which is not common for vintage Universal films.
Regarding the Pop Up Menu, I do find it slightly annoying that it cannot be accessed during the playing of the newer Universal logo, which precedes the original presentations. First World problems.
CHEERS!
At least the new Universal logo can be skipped on these releases! There are some Universal titles where if you skip it you're taken several minutes into the film. I was very pleased to discover it's skippable.