The footage from the Darkwing Duck (1991) episode The Haunting of Mr. Banana Brain (1991) is used on the tape that Launchpad and Mrs. Beakley watch, but the animation used for that scene was redone to match the animation style for the DuckTales (2017) reboot. In addition Jim Cummings becomes the new voice for Paddywhack, who was previously voiced in the Darkwing Duck (1991) series by the late Phil Hartman.
Mrs. Beakley references the issues Webby had in the past with sleepovers in both Jaw$! (2018) and The Other Bin of Scrooge McDuck! (2018), and that she was aware that Lena was involved in both of them.
Among the artifacts hidden by Webby are the Sankara Stones from Indiana Jones and the Temple of Doom (1984).
Though Duckworth appears in this episode, he has no dialogue.
The author of The Myth of the Shadow Realm is BA Beagle, who is the Beagle Boy that previously appeared in "McMystery at McDuck McManor" with BA standing for Black Arts.