The title of this episode is a parody of the musical "How To Succeed In Business Without Really Trying", which Megan Mullally (Karen) starred in on Broadway.
That the dog picture on the wall behind Karen when shes on the phone in the country club suite, winks after she hangs up and turns around.
The phrase repeated to Will in the conference room by all the partners is "One of us, one of us." This line comes from the 1932 movie Freaks.