Okay, in the scene near the beginning where John Travolta (Vincent) and Samuel L. Jackson (Jules) go to make a hit on Bret and his friends, right after Jules recites Ezekiel 25:17, he aims the gun (Vincent does too) at Bret and they waste him. You will notice that Jules fires his weapon until the slide is locked back, meaning that it is out of bullets. Well later in the movie when it goes back to that scene and it shows the guy in the bathroom and he busts out the door and unloads his gun, missing every time. Well after Jules and Vincent realize that they're not dead, they both aim and fire one shot at the guy, but how would Jules do that with an empty gun? Hmmmmm.