Kurt shows a true devious streak in "Hairography." Quinn asks Kurt to do a makeover on Rachel, hoping a sexier Rachel will distract Finn. Kurt agrees to help because he loves makeovers. But Kurt is only in the scheme for himself, as he also likes Finn, and wants both Rachel and Quinn to fail to win the quarterback. The results of his primping Rachel do not make Finn or Rachel happy. It's a betrayal of the plan Kurt made with Quinn, though not one she is likely to have a beef about. But it's also a betrayal to Finn, whom Kurt claims to care for, but really just wants to get with, and Rachel, who thinks Kurt is being friendly towards her. It is not a side of Kurt that comes out often at all, and borders on being out of character.
Interestingly, throughout all of this, Rachel says she is only interested in Finn, even telling Kurt that she is in love with Finn, and Finn is the only guy fot her. Funny, since in the previous episode of Glee, Rachel is all over Will. Did she already forget about that crush? In "Hairography," she has no problem getting close and whispering with Will, neither one having any regard for the previous week's plot. It also hasn't been that long since Rachel considers Puck as a possible mate. So obviously she is not all about Finn, even if she does definitely have feelings for him. This is a glaring weak point in Glee's continuity.
The music in "Hairography" sounds great. Not a surprise, because by this point, Glee is becoming pretty solid and consistent on the quality of their songs. There's also quite a bit of them. "Bootylicious," while not performed by the New Directions, is a fine addition to the songbook, in the way it is done in the series. "Papa Don't Preach" is incredibly enjoyable, and softens Quinn up a bit, if only for a few minutes. "You're the One That I Want" is a repeat, but is only partially shown, so it doesn't feel like much of a cheat. "Don't Make Me Over" also works.