No dogs were harmed during the production of this episode. A cat threw up and somebody shot a duck, but that's it." - The Simpsons
The 'no animals were harmed" message at the end of movies came about following the 1939 Jesse James film. In the film a horse was blindfolded and ridden over a cliff to its death. Animal safety concerns in the industry for the first time made front page news. The incident has been directly attributed to the establishment of the American Humane Society and with changing sensitivities the phrase became the trademark disclaimer for all movies involving animals.
A disclaimer in a film, novel or TV show are intended to reduce the possibility of legal proceedings or in the case of the animals disclaimer to also satisfy public confidence.
The "True Story Disclaimer" will normally be along the lines of "based on actual events" with some adding, "[but] changed for dramatic purposes". The "All Persons Disclaimer" is in every fictitious film, novel and TV show in some format. They come is various styles dealing with facts, people, characters and the wordings differ from jurisdiction to jurisdiction and so do the rules relating to how enforceable they are.
The typical "all persons disclaimer" would be something like this;
All characters appearing in this work are fictitious. Any resemblance to real persons, living or dead, is purely coincidental
The appropriate wording in a disclaimer is one of the last things looked at after we perform a pre-publication review of works.
Here are some of the more original disclaimers
The X-Files (TV SHOW/MOVIE)
This production has not been approved, endorsed or authorized by the Federal Bureau of Investigation
SOUTH PARK (TV SHOW)
All characters and events in this show —even those based on real people— are entirely fictional. All celebrity voices are impersonated ... poorly
MR MAGOO (MOVIE)
The preceding film is not intended as an accurate portrayal of blindness or poor eyesight
the great dictator (MOVIE)
Any resemblance between Hynkel the dictator and the Jewish barber is purely co-incidental
Any resemblance to actual events, to persons living or dead, is not the result of chance. It is DELIBERATE.
futurama TV episode 'the route of all evil'
Any resemblance to actual robots would be really cool
THE LOST HONOUR OF KATHARINA BLUM (NOVEL)