The references to "Jeff Vader" are related to a sketch performed by Eddie Izzard about there being a canteen on the Death Star. The original video can be found on YouTube and there is also a version acted out by Lego minifigures.
This release was originally announced to be in 3D.
Luke, Leia and Darth Vader are not related in this film.
Darth Vader is deliberately played by Lexington Steele to avoid the relation of incest with Princess Leia (played by Allie Haze).