I've only really noticed one and that was in coach carter and the reference to lebron james. The film is set in 1999 and ty crane is asked what it felt like to be the next lebron james but james wasn't even in high school in 1999. I checked imdb and apparently I wasn't the first person to notice that
I was thinking it would be good to see what movie mistakes/goofs you've noticed?
You could go to IMDB and find one and post it but that would just be cheating
