A few details I haven't seen mentioned in this thread:
1. Audrey is wearing some sort of loop ring on her right ring finger, and another ring on her right middle finger. She has no rings on her left hand, where wedding rings are generally worn. Charlie is wearing no rings at all on either hand. Given the state of their marriage, if anyone was wearing a wedding ring I'd expect it to be Charlie. But maybe the marriage was purely contractual to begin with?
2. Dr. Amp says the corporations of the world are filled with "monstrous vermin." This is one of the translations for the bug that Gregor Samsa is turned into at the beginning of The Metamorphosis. (Nabokov's preferred translation, in fact.) Given the portrait of Kafka in Gordon's office and the assorted bugs elsewhere, I don't think this is just a coincidence. Maybe it's just part of the ambient dread: Dr. Amp is paranoid up the wazoo, but something of the truth is seeping into his head and "monstrous vermin" is part of it. Or maybe Dr. Amp's gonna get his head crushed.
3. More speculation: Clark says "I won't" at the end of his call. On second watching, I wondered if he was promising Tina that he wouldn't tell Audrey whatever it was that he just learned.
4. Sarah Palmer is conspicuously buying bloody mary mix. Bloody Mary a demon that can be summoned in the mirror by saying "Bloody Mary" 13 times. We saw Sarah's tv of animals devouring each other in the mirror. And, well, we all know where else mirrors have been important. And Sarah's definitely got enough booze for 13 bloody marys! Here's what Wikipedia says:
Historically, the ritual encouraged young women to walk up a flight of stairs backwards while holding a candle and a hand mirror, in a darkened house. As they gazed into the mirror, they were supposed to be able to catch a view of their future husband's face. There was, however, a chance that they would see a skull (or the face of the Grim Reaper) instead, indicating that they were destined to die before they would have the chance to marry.
In the ritual of today, Bloody Mary allegedly appears to individuals or groups who ritualistically invoke her name in an act of catoptromancy. This is done by repeatedly chanting her name in a mirror placed in a dimly-lit or candle-lit room. The Bloody Mary apparition allegedly appears as a corpse, a witch or ghost; can be friendly or evil; and is sometimes "seen" covered in blood. The lore surrounding the ritual states that participants may endure the apparition screaming at them, cursing them, strangling them, stealing their soul, drinking their blood, or scratching their eyes out. The modern legend of Hanako-san in Japan strongly parallels the Bloody Mary mythology.
No shortage of possible Peaks associations there.