Arrival Movie Facts, Easter Eggs and hidden details

Louise knocks on window to call for Ian, similar to aliens (heptapods) trying to communicate with Louise.

The device on the agent's wrist rapidly switches between portrait and landscape mode as they take the scissor lift to the vertical gravity-controlled hallway

When Ian throws a blanket to Louise, it gets caught by something out of the frame (maybe a microphone?), then he quickly pulls it out to cover her shoulders.

Out of the two aliens nicknamed Abbott and Costello, Costello is a lot quieter and unresponsive because it knows how it's interactions with humans will eventually play out.

The song which plays during the film's opening and closing is (roughly) a palindrome - sounding the same forwards and backwards. Ties into film's themes of time, perspective, and communication. Forward version in comments.

The glass barrier that she communicates to the aliens through is just like her home with the glass window and the two trees outside of representing the aliens.

- A yin yang forms when Dr. Donnelly takes off his hazmat suit. Harmony and interconnection is a central theme of the movie.

Louise has a heptapod looking tree outside her home just before she visits the spacecraft

We see a person being rolled away on a Hazmat stretcher. We can presume the person on the Hazmat stretcher is Dr. Waller, the previous language specialist (evidence in pic description).

The idea of no beginning or end is presented throughout the film, one of which is that the music at the beginning of the movie is the same that concludes the film.

When Louise and Ian initially meet in the helicopter Ian quotes one of her writings including that language is the "first weapon drawn in a conflict". Later in the film the "weapon" that the heptopods gift to humans turns out to be language itself

The whiteboard/television is left open because the campus had to evacuate and remained open when Louise returns to her class the next day.

Louise walks down a circular corridor...

: Towards the end at the "Galla", Louise is wearing spiral earings, a small notch to the movies overall theme and use of circular logograms

Alien are terraforming earth and makeing it hotter. When anyone complains about the heat only the humans are sweating the aliens are not.

Before the soldier throws the glowstick up the passageway to demonstrate that gravity is shifted inside the alien ship, his wrist-mounted tablet's auto-rotate goes haywire, indicating that gravity is already becoming unstable

The Alien language printed as a flag can be seen hanging in the background

the trailer of Arrival, there's a shot of Chinese helicopters firing rockets, sparking global war with the aliens. This scene isn't in the movie though, and was likely an unused shot or was made solely for the trailer, probably to mislead the audience of the actual ending