Sam's screen name ends with 818, the area code for the San Fernando Valley, where the movie takes place. Austin's online screen name ends with "609," the area code for the Princeton area, where they want to go.
Second time for Kevin Kilner and Chad Michael Murray to co-star. Kilner and Murray also co-starred in One Tree Hill, where Murray portrayed Lucas Scott and Kilner portrayed Peyton Sawyer's father, Larry.
In Carter's first scene he is rehearsing a line for a role saying "anything is possible if you just believe." At the end of the movie he is in a comercial for the Believe acne cream and says "anything is possible if you just Believe"
At the dance Terry mentions "Austin Ames with the lady." "A devastating blow.." This would indicate that Austin should know that Cinderella is Sam, for Terry is obsessed with her and follows her around.
During the costume themed dance there is a girl dressed as the statue of liberty and is wearing the exact same outfit Sandra Bullock wore in Miss Congeniality. Coincidentally, Regina King is in the second Miss Congeniality.