system
Given the following post, respond as if you're commenting on Reddit:
human
[Last Action Hero] What happens to someone using the ticket when the movie ends?

So you've used the ticket and have entered a movie. You've enjoyed your time in this movie: for simplicity let's say you entered a romantic comedy. You've used your genre savvy to become part of the story, even hooking up with one of the supporting cast. The big finale just occurred (Jennifer Aniston decided her and Paul Rudd don't need to be married to be happy, so they called off the wedding and are just going to stay a couple living together). Everyone is wishing them luck, lots of little story elements are paying off, there's a cameo or two, and you swear you can hear the building of the end title music. 

What's going to happen to you? Will you live in this universe forever? Will you be ejected safely as the credits end and the projector turns off/next movie starts? Do you die when it ends? Are you trapped in limbo until the movie is replayed? 

Bonus questions: Are your changes to the movie a part of all copies, this copy or does the movie not change.
-Let's say you pull your supporting character love interest into the real world, or maybe just the cool dog or vintage car you got yourself. Are they permanently part of our world, or do they last until the movie ends as well? 
Feel free to cast this movie too.
gpt
The movie remains the same.  The official version is what it is, it doesn't change.  After the events of Last Action Hero, people weren't wandering around questioning why Death disappeared from the classic film "The Seventh Seal".  And even with the publicity stunt at the premier with Arnold, people in the theater weren't questioning why some kid suddenly appeared on the screen.

You get to interact with the world of the movie, but it basically changes only on that particular viewing.  So when the movie would normally end, Jennifer Aniston and Paul Rudd go off to live their lives together.  And then you're just sitting around in a romcom world, but one where you're not the main character.  Yes, women here tend to fall for creepy stalker behavior (want to win a woman over?  Follow her to the airport and make a big scene!), and everybody seems to have a sassy best friend who is full of insightful but obnoxious advice, but otherwise things are the same.  You still have to get a job and pay bills.

You've got the magic ticket, so you can leave whenever you want.  Remember, this is a window into a world where the movie is real.  Stuff exists beyond the visible aspects of the film (Arnold's character pays a guy to call and pretend to be his ex-wife).  Time progresses offscreen.  So you wouldn't just disappear once the film ended.  You'd just hang around there.  Although time does work differently, so if there's not a new sequel yet, it might be sort of a vague, undefined Limbo-like existence.  We don't know what happens next yet, so there's probably a lot of waiting around with unresolved plotlines.  You never know if Sarah is going to get accepted to art school, or what the sex of Dan and Amy's baby is, or if the killer is really dead.  Mysteries like this might hang around for *years*, but the people around you wouldn't think anything of it.  That's just how stuff works.