Hello, Ms. Cobel

The voice of the Lumon building is provided by Keanu Reeves. Ben Stiller confirmed this on the March 3, 2025, "Jimmy Kimmel Live!"

When Milchick walks Mark into his office, a light wrapped in plastic can be seen in the corner of the room by the window. The scene then cuts to Milchick placing a box down, and when it cuts back, the light is no longer there. However, when the scene cuts back to Mark a second time, the light has reappeared.