If the imposter gets voted out in the "Polus" map, the imposter will be thrown into lava, while making a thumbs up. This is a reference to the end of the film "Terminator 2: Judgment Day", where the Terminator dies in a vat of molten steel, while giving John & Sarah Connor a thumbs up.
When emptying the Rubbish Chutes, you will often find one that has a Blue Diamond and a grey and green device. This is a reference to the Henry Stickmin series, a series of Flash Games made by the artist of Among Us, PuffballsUnited. The Diamond is the Tunisian Diamond from Stealing the Diamond, and the device is the Teleporter that Henry uses in every game and almost never works.