Questions and discussion for this lecture live here. Fire away by hitting Reply below 
Why are you plotting deformed shape using just nodal displaments. Why don’t you use the general functiion Uy that we can build knowing nodal displaments. I mean, once we found out nodal displamentes UE, we can build the total function Uy which gives us displaments at any point between nodes, so, in this way we can use as many points as we want to create the deformed shape, instead of having to use more points?
There are many ways to approach the visualisation. The approach I have taken is simply the most intuitive to me and the one that I believe is most accessible to students that are new to the topic. I encourage you to explore alternatives to what I have done in the course.