Lena refers to Huey, Dewey and Louie as a "boy band". On an earlier television series, House of Mouse (2001), they actually were in a boy band called the Quackstreet Boys/Splashing Pumpkins.
The episode is a reference to cult 70s action film The Warriors, sharing a similar plot line and having many scenes that are similar to the film.
The scene where the Beagle Boys chase Webby and Lena through the streets in a truck is reminiscent of a level from the video game Donald Duck Goin' Quackers (2000), which had Beagle Boys doing the same thing with Donald Crash Bandicoot style.
The theater where the Webby and Lena first meet, and where the Beagle Boys gather later in the episode is most likely a reference to the DuckTales episode: Treasure of the Golden Suns: Don't Give Up the Ship (1987). In this episode the Beagle Boys gather in quite a similar-looking theatre called the L'Orange Theatre.