I've to give a presentation about the movie Joe and Max (2002) and mark the errors / things that aren't what really happened. But the problem is, I haven't found one single 'goof' in the movie. Can somebody help me please ?

I would really appreciate it.

IMDb is a great place to start: Joe and Max (TV Movie 2002) - IMDb

This one confused me - Joeee, by 'goofs' do you mean exaggerations or fictional situations put into the movie that did not actually happen in real life? Is that what you're looking for? If so, maybe you could look at it as what was not included in the movie, rather than try to find 'goofs' (as you say) in the film. Significant things missing from the movie could be considered 'goofs' as well. Do you know the actual history of the two fighters? Is this movie your only reference?