Dildano's password, "Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch", is the name of a village in Wales, United Kingdom. It's also the United Kingdom's longest place name.
The scenes during the opening credits where Barbarella seems to float around her spaceship were filmed by having Jane Fonda lie on a huge piece of Plexiglas with a picture of the spaceship underneath her. It was filmed from above, creating the illusion that she is in zero gravity.
Barbarella travels to the evil city of SoGo. The name is a reference to the Biblical cities of Sodom and Gomorrah.
Roger Vadim: Jane Fonda is filmed at times, especially during the opening spacesuit striptease sequence, in the famous French director's "Vadim Tease" directorial style.