Go to the end of the movie when it is just Peter and White in the final elimination round. They have to stay inside their own triangle. When Peter throws, he takes a big step outside of his triangle. Look closely and you will see it.
nicely done my friend, good eye. i just read your slip up and watched the DVD straight afterwards and i was like "oh my god!" it is a slip up! and i watched it on the DVD so no one can whine and "oh but on the DVD..." and i just wayched the commentry and no one says "we did this on purpose" so everyone just get over it and accept that this is a slip up.