This is the first and only episode of Season 2 that does not feature Ryan Wilder suited up in the Batsuit.
Roman Sionis having his mask welded into his face due to Alice's use of the Joker's acid flower is adapted from Batman #387, where his comic-counterpart's mask ends up being permanently charred into his skin after falling into a fire. In addition, after this, Black Mask ends up being taken to Arkham Asylum, as also seen in the episode.
This episode was originally intended to be the penultimate episode of Season 2.