According to the cupcake example in the video, this is all in real-time, right? A much better experience would be warning the user as they go - the ham remains

According to the cupcake example in the video, this is all in real-time, right? A much better experience would be warning the user as they go - the ham remains in their "cart" and is clearly flagged as abandoned (maybe with a push notification if they don't have the phone out, though I imagine most customers will be double-checking).