Disney honors 22-year-old ticket with one day left on it Tickets in 1994 didn't have expirations--so the remaining day was simply . . . a valid admission on that ticket. "GUEST USES VALID TICKET TO ENTER PARK!!" might be a more useful headline.
A friend of mine actually did something similar a couple weeks ago. She had an old ticket from the early 90's with an unused day on it, and she was able to trade it in for a one-day ticket. I was surprised they let her do it, since it was a kid's ticket, but I guess technically it was her ticket, even though she was no longer a kid When you look at how simple and favorable Disney's tickets used to be, it's a wonder that anybody tolerates the byzantine structure we have today!
The video clip isn't accurate either. She didn't spend the entire day "for free", she simply used an old (but still valid) ticket to enter. I'm a little confused about the child vs. adult thing too, but I suppose the ticket is only valid for the original purchaser or something? I seem to remember there used to be names on the tickets, and even a face scan at one point (though that may have been an AP)? So if a child uses day one, then I suppose that non-expiring ticket is good for that same person whenever they choose to use it up (otherwise only adult tickets would never expire).