On Netflix, the description of the episode read "Erin ruins Pam's painting" but this only occurs in the extended edition of the episode, which was never available on Netflix. In later episodes, the painting is switched with an inspirational photo for awhile.
The show references The Sopranos (1999) as the Mob member is suspected of being in Waste Management, as Tony Soprano is. Michael's use of "Gaba-gool" is also a reference to The Sopranos (1999), as "Gaba-gool" is Tony's favorite snack.
At around 7:20, Andy tells Michael that he will get "a dead horse's chopped-off head" put in his bed, in response to calling the police on Mr. Grotti, the presumed Mafioso. This, of course, is a reference to the movie The Godfather (1972), in which director Francis Ford Coppola actually used a real, dead horse head for the famous bed scene.
This is the first episode to feature the shortened version of the opening credits, only featuring the Penn Paper tower, the Scranton Welcomes You sign, and Michael straightening his Best Boss Dundie on his desk.