After they mention a few boxing metaphors, Shawn tells Gus to "ring the bell," and he says "ding, ding" in the same manner as Apollo Creed (Carl Weathers) in the final scene of "Rocky III" while preparing to fight Rocky, and then Gus looks directly at Boone (also played by Carl Weathers).
Chief Vick says that she has "put a hold on all vacations," and Shawn adds, "and 'Vacation' sequels; I think the Griswolds have been through quite enough."