When discussing why Mike is bringing a gun to the party, Tim is sculpting his mashed potato to look like The Devil's Tower, a rock formation in North America; a clear reference to Steven Spielberg's Close Encounters of the Third Kind. Pegg later went on to co-star in Spielberg's adaptation of the novel Ready Player One.
Daisy and Tim's fridge freezer, which they think may have a mind of its own, is called "CAL 900". This is a reference to the computer from '2001: A Space Odyssey' which is called "HAL 9000" and also has a mind of its own.
Movie reference: Tim and Mike assume the classic pose from Reservoir Dogs often seen on that film's cover. Tim is on the ground pointing his (finger) gun up, while Mike stands over him pointing his gun down.