I only bought the four Deluxe Studio Series toys, and apparently it was telling the cashier on the computer screen that they were excluded from the sale, so they had to manually apply the credit, to deduct $28 from the total bill.

Since there were other Movie toylines excluded from the discount, it is possible that the Studio Series was meant to be on the list, but maybe it was left off the in-store signage, and is noted somewhere online instead.