I've read a number of questions on the topic of giving or receiving feedback:

 - https://workplace.stackexchange.com/questions/34314/how-do-i-give-feedback-to-a-manager-that-doesnt-see-the-forest-for-the-trees
 - https://workplace.stackexchange.com/questions/64267/how-can-i-give-feedback-without-hurting-the-other-person
 - https://workplace.stackexchange.com/questions/154/how-do-you-criticize-give-feedback-someones-work-without-demotivating-them
 - https://workplace.stackexchange.com/questions/75496/is-it-ethical-professional-to-give-feedback-to-a-candidate-during-an-interview

In the cases sampled, they often relate to environments where there is a hierarchy (manager:employee), peer-to-peer (employee:employee), etc.

But in the case of a classroom styled seminar (in my case, a seminar on R) for beginners. As someone who has experience with the language, I found that there were a number of flaws in the epistemology and how the seminar was structured for beginners.

The flaw wasn't in terms of style or eloquence as the presenters were confident in their knowledge but rather of content. What they chose to present and the manner (order and density) of which it was taught.

My goal is to help as I believe the spirit of the seminar is good (teaching beginners about R), but as a relative unknown (relative to the presenter, I am not a mentor, their instructor, or their close friend) I don't see a means of pointing out flaws without insinuating that the entire seminar was flawed. 

**As an audience member, how can I effectively give feedback without coming off as pretentious or condescending? At the same time, is it my place to actually give detailed and in-depth feedback?**