During a pursuit, Jackie is on a motorcycle being chased by 4 black cars. At one point he gets trapped in an alley, and he drives back over the cars that blocked the alley behind him, smashing many windshields in the process. He then throws some red paint on one car's back window. The pursuit resumes in the streets and all the windshields are fine.
In the German dubbed version, Jackie refers to Elsa's house as being "for rent" while the sign outside actually reads "for sale" ("se vende").
During the car chase with the various black cars, right at the end when 2 of them go into the water and jackie is seen to grab onto a hanging crate, you can see one of the passengers pop out of the vehicle and give the thumbs up (I'm ok) to the safety crew
When Elsa runs into her bathroom to relieve herself, she can still be seen wearing her panties when she sits down on the toilet.
During the first invasion of the sand people, a "KISS" medal can be seen on the head of the guy in charge.
During the car chase and motorcycle scene, in the top angle shot while JC ran over the windshields (only the lead car had cracked windhields), but no cracking is seen. But when the vehicles are backing out, all of them had cracked windshields.
The World WAR II-era self-destruct system was timed with an electronic analog clock, which did not exist at the time.