* CreatorBreakdown: Creator/BillMurray was going through a divorce during filming, which, coupled with arguments with Creator/HaroldRamis over what direction the movie should take, led to their friendship breaking down.
* DuelingMovies: ''[[http://www.imdb.com/title/tt0106188/ 12:01]]'', though it's an expansion of the [[http://www.imdb.com/title/tt0098962/?ref_=tt_trv_cnn 1990 short of the same name]], ''12:01 PM''.
* EnforcedMethodActing: See MistakenForGay below, and then realize that that scene was ''improvised'' by Bill Murray; Ned's reaction was largely genuine. Stephen Tobolowsky (who plays Ned) is a great character actor, and did plenty of improvisation in the film, too.
** As is usual for Bill Murray, when Rita slaps him, she really does hit him hard. Not surprising, since all of the abuse Murray suffered from Carol Kane in ''{{Scrooged}}'' were real as well.
* HeyItsThatGuy: Did Phil just buy [[Film/ManOfSteel General Zod]] and his new wife tickets to Wrestlemania?
** Larry, the cameraman is [[Film/SnowDay the Snowplow man]].
* HeyItsThatVoice: The young bride-to-be/bride in the final loop is HyndenWalch, aka ''WesternAnimation/TeenTitans''' Starfire! Glorious!
** The mayor is [[WesternAnimation/TheMarvelousMisadventuresOfFlapjack Captain K'nuckles]].
* RetroactiveRecognition: The groom who receives the ''Wrestlemania'' tickets? MichaelShannon.
* ShrugOfGod: How long Phil spent in the loop. Harold Ramis said it was ''10,000'' years, while Bill Murray mentioned they discussed it and decided on "about ten years" (widely thought to be the "correct" answer).
* ThrowItIn: After Phil smashes the radio, ''it keeps playing "I Got You, Babe"''. However, that wasn't ''supposed'' to happen. It was such a wonderful, dark moment that Ramis left it in.
* TypeCasting: Mostly Bill Murray, alternately played straight and inverted during the course of the movie, but a couple of the others could be described as such too.
-->'''Creator/RogerEbert''': The Murray persona has become familiar without becoming tiring: The world is too much with him, he is a little smarter than everyone else, he has a detached melancholy, he is deeply suspicious of joy, he sees sincerity as a weapon that can be used against him, and yet he conceals emotional needs.
* WhatCouldHaveBeen: The original script featured the explanation for the unending loop and its escape clause, but they found by [[DoingInTheWizard leaving it out]] made the film more magical.
** Considering the original explanation involved a curse by an ex reading a "how to do magic" book, it's less "making the film more magical" and more "removing the idiocy".
** They flirted with the idea of a DarkerAndEdgier film, by taking full advantage of the no consequences mentality, (major cruelty, murder etc.), but they decided not to, realizing a more light-hearted comedy would appeal more to the general audience.
* WordOfGod: Phil ''had'' to have had days of "kill and destroy" in ten or 10,000 years he spent, [[ShrugOfGod depending on which writer you ask]], but decided it would change the tone too much and didn't show it.