Character mistake: When Will finds April's lost copy of Jane Eyre, the book shop clerk reads the inscription written by April's dad and says it's a quote from the book. It's actually a quote from Bronte's poem Evening Solace.
Definitely, Maybe (2008)
1 character mistake
Directed by: Adam Brooks
Starring: Ryan Reynolds, Rachel Weisz, Abigail Breslin, An Nguyen, Matthew Mason, Rick Derby
Continuity mistake: When Summer is singing in the park, her hair changes from in front of her shoulder to behind her shoulder in between shots.
Will: I never told you the happy ending.
Maya: What is it?
Will: You.
Trivia: The number Emily gives Will is 212-664-7665. Unlike the usual fake "555" number often used in movies, this is a real number that's also used in Scott Pilgrim vs. The World and The Adjustment Bureau. Universal Studios acquired it precisely to save having to use a fake number in their films.
Question: Do the earphones Ryan Reynolds uses at the beginning actually exist? I don't think I've ever seen wireless earphones that small.
Chosen answer: The closest thing to them available in reality appears to be these: http://www.sennheiser.com/sennheiser/icm_eng.nsf/root/press_releases__07.01.2008.