Most movie plot holes of 1989

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Friday the 13th Part VIII: Jason Takes Manhattan picture
Lethal Weapon 2 picture
Back to the Future Part II picture
American Angels: Baptism of Blood picture
The Burbs picture
Halloween 5 picture
Indiana Jones and The Last Crusade picture
The Karate Kid III picture
Blue Steel picture
National Lampoon's Christmas Vacation picture
UHF picture
The Abyss picture
Ghostbusters 2 picture
Sleepaway Camp III: Teenage Wasteland picture
The Wizard picture
Music Box picture
The Toxic Avenger Part III picture
Puppet Master picture
All Dogs Go to Heaven picture
Intruder picture