While Howard is filming Hell's Angels in this film, he gets the idea to build a single mono plane. An axe is then used to smash the support holding the wing. Yet, early on in the film you can notice the upper wing is already broken.
During Jordan's speech, he approaches an audience member and says, "Sell me this pen." As he does, he holds the pen out in his right hand, but when the camera points to the man, it's in his left hand. This is a motivational seminar, not magic show. Stick to one hand!