WB has been doing this a lot with series sets. Harry Potter Ultimate Editions changed up packaging with the 3rd movie and then again with the 7th, creating different widths and spines. Same with Adult Swim shows. I know it's nit picky, but I'm looking at the above pic and notice that the season 1 slipcover has the logo and "The Complete Season One" a tad lower than the other releases. I work in graphic design, so I guess it's just something I'm very aware of.