Well, there was a trailer and poster, not sure how extensive it was, pretty sure it was a wide release.
edit-who can compete with Porky's Revenge anyway
Weekend Box Office Results for March 29-31, 1985 - Box Office Mojo
It was interesting how the 1997 release caused EMPIRE and JEDI to switch places. As for Phantom passing star wars on the list like it means something, shee-yit. A 3D ticket here is 19.50, vs. 2 bucks or less in 1977, get real.