Gerard Argent is now one of the main antagonists for the second half of Season 6. He was last seen as an antagonist throughout the duration of Season 2, ending with the season finale, Master Plan. After this point, he became a recurring character.
In this episode, it is Mason who is suffering from post-traumatic stress and hallucinations (in this case, in the form of an after-image of the flayed, faceless body they found in the previous episode) and who offers to help Liam study for a test to have an excuse to stay the night to avoid being alone as well.
Mason references palinopsia in this episode when talking about the after-images he kept seeing. Palinopsia (From Greek; palin meaning "again" and opsia meaning "seeing") is a rather large group of psychological symptoms which can be caused by many factors; the word palinopsia itself is defined as a persistent recurrence of a visual image after the cause of the stimulus is removed.
There are two kinds of palinopsia-- illusory palinospia, and hallucinatory palinopsia-- and it is implied that the mysterious flayed creature possesses the power to inflict this symptom on others who see it.
Illusory palinopsia consists of short-lived or unformed after-images which are predictable or continuous in nature, which are caused by the brain's abnormal perception of a stimulus. It can be caused by migraines, hallucinogenic drugs, head trauma, or other prescription medications such as Trazodone, Remeron, Topomax, Risperdal, or oral contraceptives.
Hallucinatory palinopsia consist of formed after-images which are much more long-lasting and which are generally unpredictable, which seems more in-tune with the kind of after-images of the body Mason was experiencing. These usually result from brain issues such as strokes, hemorrhages, aneurysms, abscesses, and seizures.
It is revealed that the mysterious Big Bad has the power to induce crippling fear in those around it, to the point where even the usually calm and collected Melissa McCall and Chris Argent were barely able to stand in its presence. It can also seemingly induce hallucinations.
Lydia writes the number "68" in a variety of languages and codes (such as writing Er, the element Erebium, whose atomic number is 68, and LXVIII, the Roman numeral for 68) while utilizing [[Automatic writing|automatic writing. These languages include Mandarin Chinese (六十八), Esperanto (sesdek ok), Javanese (sewidak wolu), Danish (otteogtred), Kyrgyz (алтымыш сетиз), Indonesian (enam puluh lapan), Czech (šedesát osm), German (achtundsechzig), Catalan (seixanta-vuit), Greek (εξηντα οκτω), and Bengali (আটষট্টি).
Interestingly enough, some of the phrases actually mean other numbers as well, such as the Basque "three-hundred thirty" (hirur ogeitazortzi) and the Albanian "sixty" (giashtëdhjetë etetë). It is unknown if this is intentional or simply a goof.