'''Music/Sounds Variants:'''
* In some cases, it uses the closing theme of the show or is silent, such as on ''Alien Nation: Body and Soul''.
* There was a low tone of the remastered 1989 theme from 1992-1995 on reruns of ''Dynasty''. It was also used on the 1994 logo on prints of ''M*A*S*H''. A low tone version of the 1995 theme exists. This was spotted on a later French print of the pilot episode of ''Manimal''.
* A low tone version of the 1995 theme exists. This was spotted on a later French print of the pilot episode of ''Manimal''.
* On the Fox airings of ''America's Most Wanted'' (which was co-produced by 20th Television) and other airings of some post-2020 shows on the American networks, a generic network theme is used.
* A version exists on 2007-2008 episodes of ''Family Guy'' that is the present day jingle, but sounds like it is played on a xylophone.
* Syndie prints of ''Family Guy'' and ''Batman (1966)'' using the '921992 logo have a loud, pronounced version of the 1995 TCFTV jingle. When syndie/network prints of ''Cops'' and other shows use this jingle, it sounds normal.
* On older syndicated prints of [[Revolution Studios]] movies, the Bruce Broughton version of the TCFTV jingle sounds rather loud and is slightly cut off at the beginning. One example is the syndicated print of ''13 Going on 30'' when it aired back in January 2010.
* Since sometime in 2012, on syndicated prints of Revolution Studios movies, the sound quality of the 2008 jingle (variants of the 1997 20th Century Fox jingle) -- whether short, normal, or long -- sounds a little less crisp. One example is the 2013 syndicated print of ''Perfect Stranger''.
* On some [[Fox Television Studios]] shows like ''The Hughleys'', this logo plasters said logo, but its jingle/sounds remain intact.
* On airings of the ''M*A*S*H'' S1 episodes "Love Story" on Hallmark Channel and "Cowboy" on DVD, on Centric's airing of ''In Living Color'' S2 episode "Anton at the Recruiter", the 1995 [[20th Century Fox Home Entertainment|Fox Video]] VHS release of ''The Making of Star Wars'', a later print of ''The Paper Chase'' S1 episode "The Man Who Would Be King", and a CBS Drama (UK) airing of a season 7 episode of ''Dynasty'' ("The Affair"), the 1965 TCFTV theme is heard, due to sloppy plastering. A variant with the 1965 TCFTV theme in low tone exists. This was spotted on a later French print of the second episode of ''Manimal''.
** A variant with the 1965 TCFTV theme in low tone also exists. This was spotted on a later French print of the second episode of ''Manimal''.
* On Me-TV's print of the ''Batman'' S2 episode "That Darn Catwoman", the 1961 TCFTV theme is heard. On 2008-2010 episodes of ''Family Feud'' and local syndicated reruns of ''Futurama'', the 1995 and 2008 themes were edited a bit, with the second half only.
* On syndicated prints of shows like ''King of the Hill'' and ''Cops'', the original 20th Television or TCFTV jingles from 1995 and 1997 may be heard during the 2008 or 2013 logos. In exceptional cases, a soundbite of the show is used.
* On FXX airings of ''The Simpsons'' episode "Days of Future Future", the logo is silent. The [[Gracie Films]] logo has the 20th TV logo's music playing over said logo, while the Spanish cast has the [[Gracie Films]] theme playing over it. This was likely caused by an editing goof.
* On airings of the ''Family Guy'' episode "He's Bla-ack!" on Adult Swim, the 2013 20th Television logo is used, yet the 1995 fanfare is heard. Usually, the 2013 TCFTV logo is used on newer episodes and other airings of said episode, with the correct fanfare.
* On the syndie print of the ''Family Guy'' episode "Chris Cross", a portion of the '082008 20th Television fanfare used on the 2007 TCFTV logo can be heard when cutting to black before the SAP cast.
* On [[Channel 4|Channel 4]] broadcasts of a small number of episodes of ''The Simpsons'' (noticeable on the episode "Last Exit to Springfield"), the audio for the 1992 fanfare fades out very quickly as the last note plays.
* On some episodes of ''Family Guy'', AMC's airings of both ''Omen IV: The Awakening'' and ''Mr. Popper's Penguins'', and CourtTV Mystery's airings of ''Sleeping With the Enemy'', the 1995 theme is heard on the 2013 logo.
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