I for sure noticed a big difference. IN the american video's, you see alot of high drops but not alot of precision jumps or cat leaps and many other techniques that you see in european videos. It seems that they just learn to monkey vault and do that over 10 foot plus drops. Its horribly annoying and it makes me kind of embarrassed. I believe it has alot to do with the skater culture, and youll find alot of skaters turning to parkour, and only doing high drops because they still have that skateboarding mentality. "believe me, i know i skateboarded for 6 years." This really scares me as i hope that this isn't the direction Parkour is heading in america.