"I gave her my heart, and she gave me a pen." was voted #73 of "The 100 Greatest Movie Lines" by Premiere in 2007.
Both actors in the famous boom box scene were filmed separately. John Cusack held the boom box in the middle of a park in North Hollywood across from a 7-Eleven.
John Cusack's kick boxing scenes in the ring, including the one where his nose is broken, are done with Don Wilson who is a real-life kick boxing champion.
Producer James L. Brooks said the movie was inspired when Brooks saw a man walking with his daughter, and wondered what would happen if the father committed a crime.
Don Wilson: Professional martial artist, 'The Dragon' Wilson, whom Lloyd had mentioned earlier, makes a brief appearance in the film. Seven years later professional martial artist Benny Urquidez would appear in Grosse Pointe Blank (1997) which also starred John Cusack.
Cameron Crowe: and wife Nancy Wilson as pedestrians in front of the mall as Lloyd passes by while recalling the site of their first "date".