Santa's Holiday Adventure is a reference to a real place in Miami called Santa's Enchanted Forest. The amusement park is only open a couple months of the year (typically just before Halloween through early January). While the show depicts it near the water, Santa's Enchanted Forest is in the middle of Miami and not near the beach.
Harry says to Dexter the 'Price is right' when they find the Aconite. This is a reference to the popular game show, The Price is Right (1972).