5. The Recurring Hockey Mask
This one fascinates me. I think it's probably a rare occurrence in movies to carry the same prop forward from one movie to the next, yet that's exactly what happened with Jason's hockey mask from F13 III through VI. Of course, the same mask from Part III and Part IV didn't make an appearance in the horrendous F13 Part V, where Jason wasn't the killer, but our favorite mass murderer reacquires the mask in F13 VI after he is turned into a zombie by the constantly recurring Tommy Jarvis. On a side note, I think Part VI is the best of the Tommy Jarvis movies. I'm especially glad they didn't turn Tommy into the new Jason as was implied at the end of F13 V. A movie named Tommy Takes Manhattan would have been just as disastrous a title as Josh Takes Manhattan.