onlyabidoang has a video of a height mod and some examples of how it works https://www.youtube.com/watch?v=EjZEFPsNU6Y&vl
so basically the more you change the height, the more noticeable will be the glitching animations. the mod he's showcasing (it's the one i'm using as well) has many options for if you want to see a big or a slight difference.
however once you put it in your game, your townies will get their height changed randomly but if you remove the mod they will turn the same height again (but anyways you can change their height on cas as well). there are a few other mod sliders out there like the luumia presets but i've never tried it, though probably there's a video about it on youtube. height sliders are quite fun if you like to take screenshots of sims posing (there are also some adapted poses out there for taller/shorter sims) or if you would prefer teens to be shorter, but if you get annoyed by the animations it won't be a great addition to your game