Treating the property of others with care: Bava Metzia 24a
One ought not to spend too much time with those who aren't careful with Torah, especially with Kohanim like that, as they will cause him to sin: Nedarim 20a
When people sit together, the greater of the two sits on the right. With three, the greatest is in the middle, the second is on the right: Eruvin 54b
Considering the issue of strain vs. the issue of respect: Eruvin 54b
Learning lessons in manners from the animals: Eruvin 100b