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.
When the sword is being auctioned, the auctioneer says it was used by King Arthur during the Crusades. Arthur is said to have lived in the 5th to 6th century, which was about 600 years before the first Crusade.
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.
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