When Daryl drinks straight from the punch bowl it contains less liquid then the next scene when it's positioned in front of him.
There are many mistakes in Oscar's description of Zwarte Piet ("Black Pete"). First, the character is the assistant of Saint Nicholas in the Netherlands and Belgium, not Belsnickel's. Second, Saint Nicholas celebration in the Low Countries ends after 5 December, so Black Pete isn't associated with Christmas. Third, Black Pete is not supposed to be a slave but a manservant.