The characters alternate between calling Nina Foch's character "Madame Tra-vee" and "Madame "Trav-eye".
During the final confrontation, Kolchak picks up and puts down the mojo bag three times.
During the fashion show at the beginning of the episode, Madame Trevi announces a "return to nostalgia". Later during an interview with Carl, she tells one of her designers "Cornelius, we're not doing nostalgia anymore!"
Someone off-screen obviously throws the cat on Ariel: its legs aren't in a leaping position.
At the end of the lecture on witchcraft, Griselda tells Carl that she doesn't endorse individual covens. Less than a minute later, she endorses an individual coven. This is clearly deception on Griselda's part. The coven she directs Kolchak to is one that she belongs to. That coven tricks Kolchak into committing harm against Madame Trevi by destroying the artifacts Trevi is using to ward off the black magic being used against her by Madelaine, who also belongs to Griselda's coven. A disguised Griselda even gives Kolchak the list of items he is to destroy.
It's not clear why Madelaine needs to trick Carl into destroying Trevi's power objects, when she has a coven of normal humans to help her.
Carl is told a witch's immunity to drowning proves she's a witch. But later he tries to drown Madelaine when he already knows she's a witch.