* TheCastShowoff: Usually inverted. Kevin Murphy and Mike Nelson can both sing but they usually get Disembaudio to sing (badly) during the closing credits. Sometimes they play it straight and let Kevin show off.
* HypeBacklash: The intro and outro to ''Film/TheDarkKnight'' is all about how people, especially on the Internet, were proclaiming it to be the Greatest Film Ever Made. Bill ties a rope around his ankle, like priests in the book of Exodus, in case the splendor of the movie literally kills him and they have to yank his corpse out of the recording booth. Kevin warns the others that he may weep openly, [[SubvertedTrope though]] it later turns out he thinks they were going to watch ''Film/FirstKnight'', and says that ''Film/TheDarkKnight'' [[HypeAversion sucked]].
* MissingEpisode: The guys couldn't get the rights to release their live action riff of ''Film/StarshipTroopers'' on DVD, necessitating a separate audio recording.
** This seems to be the default situation for the live episodes from Sony, as ''Godzilla'' won't receive a DVD release; instead, they included a gift certificate for the Rifftrax site for supporters in a certain tier to compensate for them having to get a DVD of ''Godzilla'' to play the riffs.
** The DVD release of their ''Film/ManosTheHandsOfFate'' live show removed all references to ''Manos 2: The Search for Valley Lodge''.
** Ditto for the live action riff of ''Film/TheRoom'' "due to a certain litigious cast member who will remain nameless".
* OfficialFanSubmittedContent: The jokes for the ''Film/BatmanAndRobin'' trax. The live showing of ''Film/SantaClaus1959'' had one riff by a fan for a contest as well.
* OneOfUs: The commentaries feature frequent references to nerdy or geeky activities/interests, unsurprising considering we're their target audience. In the ''Film/HarryPotter'' Rifftrax, several jokes were made referencing things that were either only in the books, or hadn't been introduced yet in the films (like a joke involving Horcruxes before the ''Half-Blood Prince'' film had been released). In the ''Film/LordOfTheRings'' rifftrax, the guys gushed about Middle Earth and its rich history, like Mike giving a detailed explanation of the meaning behind Aragorn's war cry "Elendil!" Video game references are the most frequent and generally occur with the least provocation. Mike makes jokes several times that hint he spent most of his teen years playing NES games, and jokes about more modern video games like ''{{VideoGame/Portal}}'' get brought up as well, though they have more of a WereStillRelevantDammit feel to them sometimes.
** It seems that Bill Corbett is a dyed-in-the-wool Whovian -- during the riff of ''Film/DrWhoAndTheDaleks'', he was the one who made riffs about the movie not being canonical, and during a Christmas live-riff show was seen wearing the Fourth Doctor's scarf.
* {{Padding}}: The guys never fail to mock examples of this each and every time they see it. And since they riff a lot of low-budget movies with paper-thin plots, they have many, many opportunities to do so.
* TechnologyMarchesOn: Extrapolated backwards in ''Film/CaptainAmericaTheFirstAvenger'' with a giant metal disc that holds ten thousand bits of information.
* ThrowItIn: If they think a joke is particularly funny the crew will leave their laughter in as opposed to editing it out. During live shows, it can go on for several minutes and almost derail the commentary.
-->(After Kevin's "Whoa!" when Santa says to Rudolph "I need you tonight" gets an especially huge response)
-->'''Bill:''' Well, we lost three lines in that.
-->'''Kevin:''' It was worth every moment.
* WhatCouldHaveBeen: The guys wanted to riff ''[[http://www.imdb.com/title/tt0068248/?ref_=fn_tt_tt_2 Baffled!]]'' and ''[[http://www.imdb.com/title/tt0077942/?ref_=fn_tt_tt_1 Moment by Moment]]'' but they couldn't get the rights.
** Similarly, they tried to make a live show of ''Film/TheRoom'' but Tommy Wiseau wouldn't let them, not right away at least (Apparently he called their office and yelled at whoever answered the phone.). However, this is changing since they are in fact doing a [=RiffTrax=] Live for the movie one on May 6th, 2015, since they raised enough money with the Kickstarter project.
** They really want to live-riff ''Film/MiamiConnection'' but Alamo Drafthouse didn't want to license the film to them. However, this changed with the upcoming [=RiffTrax=] Live that's coming to theaters on October 1st, since the Kickstarter project raised enough money.
** ''[[http://www.imdb.com/title/tt0077942/?ref_=fn_tt_tt_1 Moment by Moment]]'' was never released on home video due to its poor reception so a normal Rifftrax mp3 commentary is impossible due to that which is why they would need to license it.
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