I'll start from the very beginning. In 2015, on October 16, an event took place with the seiyuus and the creators of Osomatsu san. There, they talk about the production of anime, had fun and the creators hold a quiz. And the seiyuus try to guess the answers to the questions “What would the sextuplets take with them to a desert island?” and "What are the sextuplets' fetishes?" All this was done so that the seiyuus could get to know their characters better.
This information was published in one of the issues of PASH! and in the official fanbook.
This information about the sextuplets is officially canon, since Totty even discusses it in episode 14.
If you are interested, you can also watch this event in Japanese with Korean subtitles.
Osomatsu San Live Action Movie Now Available for Download
The infamous live action Osomatsu San movie staring Japanese idol boy band Snow Man has finally leaked online and is now available to watch! The link I've provided will take you to a dropbox with a 30 minute preview of the beginning of the film you can watch online and if you want to watch the rest of the movie (It's nearly two hours long!) you'll have to download it.
EDIT: The dropbox link I put up is not working at this time (but may work again in the future so I'm not removing it), so here's a link to a google drive with the movie, hopefully it stays up a little longer:
There are no English subtitles, so good luck trying to figure out what the plot is, but it's still delightfully insane to watch and you get to see all your favorite Osomastu characters in 3D which is even more of a trip to the uncanny valley than you could have ever imagined!