1989: A Year of Sequels
Many successful films were released in 1989, particularly throughout the summer. See the Lethal Weapon 2 IMDB thread titled: 1989 was one hell of a summer.
I especially remember that 1989 was touted as a year of highly anticipated sequels and latest installments of successful film franchises. A few turned out to be quite good, while many were disappointments.
Back to the Future Part II
Friday the 13th Part VIII: Jason Takes Manhattan (8th film of series)
Fletch Lives
The Fly II
Ghostbusters II
Indiana Jones and the Last Crusade (3rd film of series)
The Karate Kid, Part III (3rd film of series)
Lethal Weapon 2
National Lampoon's Christmas Vacation (3rd film of series)
Star Trek V: The Final Frontier (5th film of series)