* 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".
* 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.