Thank you for playing! Glad you enjoyed the game! Yeh these are the things that we've done badly, and the game really suffers for it. Especially telling what the player did wrong would be hugely beneficial. It's like that you've encountered a customer trying to swap out the discount label, making the item shown on screen not match what you've scanned. The correct course of action here would be sounding the alarm, but I don't think we did a remotely good job of telling this to the player. Anyway, thanks for your detailed comments, and it will certainly help us a lot.