Maybe the other customer didn't care enough to demand a manager and make a big deal out of it. Store employees make mistakes, some customers understand that. For me, the explanation that it isn't supposed to be sold until the movie comes out and someone messed up by putting it out early would be good enough.
Honestly, I get there are mistakes. Everyone makes mistakes. We've all made mistakes. I've had retail employees make mistakes plenty of times and I say no problem, I let it go, etc.
However, it seems to me there's been a real increase in some stores completely not caring at all where they shelve things, if the signage is correct, if things ring up correctly, etc.
Target, at least the one I'm familiar with, is especially bad about this lately.
I recall the first time this happened there, a looong time ago, finding an item on an endcap, maked on top with the big red SALE, with a price, and one item shelved on three shelves. I assumed that was the price and when the thing didn't ring up that way, asked. The cashier paged a mgr, who went to look, invited me to go along to see, said whoops, they hadn't removed the sale/price signage, so sorry, but of course the one I was buying would be that price - as the mgr removed the sign himself and called an employee over to get the correct signage from wherever.
A few months ago, buying light bulbs, three pegs had sale prices, I picked from those, they rang up like $5 higher a piece (CFL multipacks). I said wait, they were supposed to be X, not Y. Cashier said no, they're Y, kept scanning. I said no, they were marked X, that's why I bought them. She shrugged and said they're Y. I said can you get someone to check please? Sighing, lighting the thing. Someone comes over (it wasn't busy btw), we go through, she scans it with the hand scanner and says it's Y. I go over again that the price on the display is X. She wanders off, comes back like 2 seconds later and says they cost Y. I say let's go see.
We go, the pegs are marked X - I have the matching bulbs. She looks at it then says a customer must've moved them to the wrong place, they cost Y.
I realize customers dump stuff everyplace. I would not pick up a blu ray player sitting in the toy section randomly by a $5 sign and say it must be that price. These were, I counted, 21 packs of bulbs, shelved in the correct brand place, but she claimed were somehow the incorrect type that customers have neatly 'misshelved' to fill three pegs. I just gave up.
A couple weeks ago, same thing happened with sheets - a whole section on sale, all the same type/size, the sizes slightly different prices, but all discounted 50%. The one I picked up didn't scan discounted, the mgr told me maybe because that exact single sheet packet they might sell by itself at full price, even through every other size of its same type, colour, etc., was in the 50% off section. Shrug. I was annoyed enough by the stupidity of this explanation to get another manager, who, when I explained what the previous one had said, said 'what??' sighed, and said 'tell the cashier <her name> said it's supposed to be 50% off, he just doesn't want to be bothered.'
It's happened other times too - the employees or the managers telling them what to do and how to spend their time just seem to not care at all. Just stick it wherever, if someone notices the signage is wrong, blame the phantom OCD customers who reshelve the stores, or shrug.
The more it happens, the more reluctant I am to let it go.