added it and it just -- all of a sudden she just seemed more real. >> reporter: animators found inspiration close to home. >> i am an osmond. ♪ i'm a little bit country ♪ i'm a little bit rock 'n' roll ♪ >> there's a small tribute in "frozen" to my uncle donnie in "love is an open door." walking from the waterfall, hans sort of belts it out. >> sort of the family joke to kind of imitate him as they go, and do their big notes. ♪ let it go >> pretty good. pretty good. >> you like that? >> yeah. but you know you can catch actually "the story of frozen" tonight at 8 p.m./7:00 central here on abc. behind the scenes look. >> definitely check that out. haven't seen it. embarrassed to say that. >> don't be. i'm looking forward to it. we'll be back. >> announcer: this is abc's "world news now," informing insomniacs for two decades.