"Do it as your sempai shows you, even if you know it is wrong"
"Do not talk back to, or question your sempai"
I would really hate to train in a dojo that made that an actual rule and where sempais felt they were justified in 'correcting' me for not giving them enough 'respect'.
Real respect is _earned_. If someone keeps giving good helpful advice, if I can see by their example that I want to be able to do what they can do, I will quickly learn to listen to their advice - and it won't be because I was told they're my senior so I have to.