The schedule Marge is holding up and looking at during the episode's start (when Homer makes himself legally drunk so he won't have to do any driving) lists the "Pacifier Warehouse" time at 12:30, right before the "Pacifier Warehouse Return Center" time of 12:15. The "Pacifier Warehouse" time needs to be earlier than 12:15 to be accurate; presumably the error was that it was listed at 12:30 instead of 12:00 (or this is a mistake Marge made when printing out the schedule, but the show doesn't notice it so it can't be considered part of continuity).
Marge wants an ice maker for the refrigerator, the Simpson's have had one of those for years.