The bepop movie came out before the naruto episode, so i dont think that was a coincidence. narutos creators have said before they draw inspiration form alot of other anime and manga sources, in other words they rip off the best ideas from other shows.
But seriously, it wouldnt be the first time a show or movie has almost scene for scene "borowed" a sequence or scene. I remember seeing a scene by scene comparison of the original matrix and dark city on the net a couple of years ago and the similarity was too obvious to be anything but a direct ripp off. And it goes back as long as movies and tv have existed. Just look at all the westerns "inspired" by samurai movies, or comparisons between the flintstones and the honey mooners even. Its an entertainment business tradition.