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Cerebus Call Back: The dream house Matt makes for Jenna's birthday is subject to two. It's introduced in a comical yet sweet scene. Later on in the film we find out that apparently Jenna threw the house at him after thinking he scared away the party guests. Also after Matt refuses to leave Wendy she begs to have the house as something to remember him by and cries while looking at it.
Character Development: Jenna realizes that maybe there's more to life than money and success. Something more along the lines of Becoming A Better Person.
Dance Line: Jenna does this during the Thriller dance part.
Derailing Love Interests/ Disposable FiancÚ: Averted. Matt refuses to leave Wendy for Jenna and she ends up wishing herself back to the age of 13 to fall in love with him the proper way. He simply never met Wendy in the first place or, if he did, was with Jenna at the time.
"Friends" Rent Control / Big Fancy House : For a freelance photographer and a magazine editor who live single in NYC, both Jenna and Matt have pretty posh apartments. And their "dream house" when they get married also seems pretty upscale.
Jenna: Look, I won't have you be late. Just go. Go on. I'm fine. I'm just crying because I'm happy. I want you to be so, so happy. I love you, Matt. You're my best friend.
Informed Ability: Jenna's redesign proposal for "Poise" looks about like a 13-year-old's attempt at a photo collage of her friends. Justified? Well, not the part where it gets an ovation from a room full of media professionals and someone resorts to corporate espionage to rip it off for their own magazine.
Separated-at-Birth Casting: Christa Allen as Young Jenna. Jennifer Garner says that she looks identical to her when she was that age and the two were cast in similar roles in Ghosts Of Girlfriends Past.
Sleep Mask: Used by Jenna when she wakes up as adult.
Stepford Smiler: Jenna, when she wakes up 30, finds she is not the nice young girl she used to be.
The Reveal: Done twice because the first-time viewers in the audience wouldn't know the significance of the letter from the rival Sparkle Magazine that turns up in her mail in the first reveal either.
Surprisingly Lucy gets one too. Throughout the film if 'smiling' at all she is either smirking or has an obviously fake smile plastered over her face. However when Jenna plays Thriller in the club Lucy breaks into a massive happy grin and giddily runs off to join the dancing.