Agree with what you said. It is really fine to practice these for good manners but not just for the interview.
Also, one thing to point out. Normally these are what parents thought the teachers would look for. However, when you are the teachers and a bunch of kids coming into the classroom and act like a robot with the same routine, the teachers can tell the differences easily.
At the end, remember to relax and never force everything to happen as you planned. At the end, they are just 2 years old children. They should all be praised.