Continuity mistake: In her apartment Jenna walks out into the hallway, looks at herself in the mirror and stumbles backwards over the shelf behind her. There is a short stack of magazines on that shelf, yet when Jenna looks at herself in the mirror the stack of magazines is at least three times as high in the reflection. (00:14:10)

13 Going On 30 (2004)
Ending / spoiler
Directed by: Gary Winick
Starring: Mark Ruffalo, Jennifer Garner, Judy Greer, Andy Serkis
Jenna decides to go to Matt's wedding and arrives early. Matt tells her he has feelings for her, but can't let down his fiance. Jenna asks to keep the dream house out of his closet, and cries. The wishing dust on the dream house blows over her, and then she is back to being 13. Matt comes in and they kiss. She tells Tom-Tom off. Matt and Jenna end up getting married and moving into a dream house.
Jenna: You are rude, and mean, and sloppy, and frizzy - and I don't like you at all.
Trivia: When Jenna wakes up as 30, she is in the same apartment the 30-year-old woman in the magazine was in when she was 13.
Question: When Jenna has turned 30 and is going to the magazine party she has a dress on then asks her 13 year old neighbour if she can see her underwear to which the girl replies something like "I think that's the point." They then smile and laugh to themselves. Could anyone explain this joke?
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Answer: Jenna asked the girl, "Can you tell I'm wearing underwear? Because I totally am". This is because when she was 13 just a day before, she was wearing big underwear. Now she's wearing a thong, which wouldn't be visible when wearing a dress.