When Grigori (Andrey Ivchenko) storms the farmhouse, his mechanical gait, clenched jaw, spiky haircut, emotionless, European-accented voice, and overall robotic motions (like when hip-firing his AK-47 at a fleeing vehicle) are all highly suggestive of the menacing cyborg mannerisms of Arnold Schwarzenegger in The Terminator (1984) (even the clanky synth music that swells at the end of this scene is similar).
The logo for Hawkins Memorial Hospital is exactly the same as the one for Haddonfield Memorial Hospital in Halloween II (1981).
After Grigori (Andrey Ivchenko) is finished shooting at Hopper (David Harbour), Joyce (Winona Ryder) and Alexei (Alec Utgoff), the framing and pose are a direct imitation of the box for The Terminator (1984).
This is the first time this season that Nancy (Natalia Dyer) and Jonathan (Charlie Heaton) share scenes with the rest of the kids.