Cadence arrives for the wedding on a 727. Closer examination of the aircraft's livery reveals it is a Kitty Hawk Airlines aircraft. This would be fine were Cadence air freight, as Kitty Hawk is a cargo airline.
During the bachelor party, Stifler catches Bear trying on a pink dress. Stifler then calls him "Buffalo Bill" and says to him: "It puts the dress in the drawer and does as it's told." -- a reference to "Silence of the Lambs".