I think that clip needs to be appreciated as a bit of tongue in cheek. However, I do think that it is worth pausing to reflect and identify the ingredients of a "good" performance.

Leeneia that is a super list of advice. The only additions I would make would be

1)KNOW your materials. Call me old fashioned but I don't like to see people singing with lyrics/notes on a music stand in front of them when I have paid good money to see them. It might be tolerable for ONE number (e.g. "Someone asked me to do this old one and it's been a while so I need to jog my memory..."). I would also extend this rule to include knowing roughly what your set list is going to be *having designed it using Leeneia's guidance!). I find it very irritating to what someone scratching their heads and going "ermmmm, what do you fancy next?". OF course some flexibility is essential too, so a set list is a plan that you may need to deviate from according to circumstances.

2) Having engaged your audience early on (by telling them how glad you are that they are there, as per Leeneia's list) keep that relationship going, notice the collective mood and respond as appropriate. This may need to include developing a few skills in handling hecklers, but that is all part of live performance.

If you have done your groundwork as a performer you should be able to feel relaxed and confident on stage, and build the rapport that is an essential ingredient for a good live performance.