U-Leonard Di Caprio uza kudlala indima enkulu kwifilimu "igumbi elinabantu abaninzi" esekwe kwimisitho yokwenyani. Umdlali weqonga uza kusebenza umfanekiso kaBilly Milligan kwiscreen - ulwaphulo-mthetho lokuqala olufanelekileyo ngexesha lokuvavanywa ngenxa yokuqonda "ubuntu obahlukileyo".
Lo mfanekiso usekwe kuxwebhu lwesiRoma uDaniel uKiza "amaBholeji amaninzi Billy Milligan", epapashwe ngo-1981. Batsho nge-di caprio bekuphupha lohlolo lwale ncwadi kangangeminyaka engaphezu kwamashumi amabini. Kwaye ngoku, wayithatha le projekthi. Ukongeza kwinto yokuba uLeonardo uza kudlala indima enkulu, uya kumxhasa umvelisi wefilimu. UJason Smilovich ("Inambazana eyonwabileyo yekhoboka") naseTodd Katzberg, owayesebenza nentembeko yongcelele lwamanqaku "okhuselweyo" wathabatha ukuziqhelanisa.
UBilly Milligan wafumana i-fame ebanzi ngasekupheleni kweminyaka yoo-1970, xa etyholwa ngeziphangi ezininzi kunye nodlwengulo oluthathu. Nangona kunjalo, amagqwetha akhe avakalisa ukungabinamthengi wakhe, ukuxambulisana ukuba ezimbini zobuntu bakhonze ezi zonakalo ngaphandle kolwazi lwe-milligan. Ngenxa yoko, ulwaphulo-mthetho lwalulungiselelwe, kodwa lwathunyelwa kunyango lwengqondo.
Ukutshintsha-ubuntu eBilly bavela kwiminyaka emithathu okanye emine. Kwiminyaka esibhozo-thoba, inani lezinto zobuqu liye landa. Emkhulu esele ikhulile, i-milligan yayinemintu engama-24 ebunjiweyo, eyayilishumi kubo eyona nto iphambili. Wakhululwa ngo-1988 emva kweminyaka elishumi yonyango olunzulu. Ukuza kuthi ga ngo-1996 wayehlala eCalifornia, emva kokulahleka kwakhe. NgoDisemba ka-2014, kwaziwa ukuba uBilly Milligan walala iminyaka engama-59 kwikhaya labalupheleyo eOhio.