Her exact thoughts on the finished movie aren't recorded, as she refused to comment; but it is notable that the next Animated Adaptation of a Lindgren book, Karlsson on the Roof, was given much stricter guidelines for script, design and tone.
Fountain of Expies: Pippi has served as the inspiration for a lot of spunky red-haired heroines over the years. One notable modern example is Lisbeth Salander of The Millennium Trilogy (although she dyes her hair jet black), and it's even lampshaded in one of the books.
A lot of the concept art did make it into later pictures though, especially the extensive background work in Visby and Stockholm which became most of the backgrounds for Kiki's Delivery Service. Pippi's braids are resurrected in the pirate queen from Laputa, who has a youthful portrait in her airship cabin looking suspiciously like Pippi...
Word of Dante: Everybody in Sweden knows that Pippi's horse is named Lilla Gubben. This name never appears in the books, who simply refers to Pippi's horse as "Pippi's horse." The name incidentally means "Little Old Man" and originated in the 1969 TV series — though even there, Tommy (as the voiceover narrator) explains that the horse doesn't have a real name; "Lilla Gubben" is an affectionate term Pippi uses when talking to him.note The term is quite common in Sweden, especially about young boys (despite meaning "old man", the word "gubbe" is often used for basically anything humanoid: a stick character is a stick "gubbe", a smiley face is a happy "gubbe", a video game character is just a "gubbe" and so on). May also be used patronizingly (especially towards adult males).