I believe I've seen him use shims (wooden shims) in the glass doors to prevent them from sliding until he removes them. I did notice in a recent video that there wasn't a shim in place, but maybe he's removing them now before filming or isn't using them anymore. I do like that there is a verbal warning about keeping hots in his intro, but agree about the "dramatics". I've only occasionally watched him. I agree that I wish he talked more about each species while working with them it would make it a lot more educational.