The song being played while Doug is in Stewie's room is "The Teddy Bears' Picnic" by Henry Hall and His Orchestra from 1932.
The episode title is a reference to the 1945 film of the same name.
The knife Stewie brings with the intention on killing Miss Tiggywinkles is the same knife from Cobra (1986)
The song being played at the end of this episode in the "to be continued" gag is Roundabout by The band Yes.
When Stewie breaks into Doug's home, he claims he's never been there before. But he was forced to help Doug with activities in the first episode, Lasik Instinct.