I along with many others before have tied many rolling hitches, but I learned something new today, there is more than one type of rolling hitch!!
I must admit I don't fancy this one as it looks like it has the potential to collapse, jamb or even slip undone under excess wet load, different ropes, rails etc.

Having said that if it is likely to take significant load then a different method of attachment should be employed. (considering viewers maybe employing this knot for use other than sailing).
I prefer the rolling hitch where two turns; double lock, the standing part before the final hitch.
The rolling hitch I prefer is #1735 pictured on wikipedia, knot #1734 (the one in this video is also there and described as a rolling hitch but also as a clove hitch with extra turn).

I love skipper Johns tips, so this post is no criticism because it is correct this is a rolling hitch, however #1735 is the more secure rolling hitch taught by the RYA in the UK and Naval institutions, it is also noted as being the more secure of the two (or 3) rolling hitches. Maybe Skipper John could revise this video and give both with emphasis on #1735 being the more secure?

this is clove hitch!

your knot is wrong. there should be two turns over the jam. a prussic loop has superseded the rolling hitch' merchant sailors use it as a stopper knot on short lengths of rope beside a towing winch to hold a heavy wire or chain temporarily.

Thanks so much Cap'n John. Just want you to know that I really enjoy and wait in anticipation for every video you post. I'm just looking it the website also but wanted you to know how much your posts are appreciated!

Very nice. I do tie a backup once aloft, but this knot will be an improvement over what I have done. Having had the other problem many times (before angling my sheet blocks!) I could have used the winch trick. Thank you for clarifying!

I've watched lots of your videos and liked them all. This one leaves me a bit confused. I understand the knot. You say to use it as a backup going aloft. How? I tie a bowline on my bosun's chair. Are you suggesting tying the bitter end off again somehow? And to free a jammed sheet on a winch? I am very curious as to what you meant by these two comments.

By claiming that's wrong without revealing the right one only shows your arrogance and limited knowledge of this knot. It's not wrong. There are many ways to tie this knot with little variations here and there. As showned here, this is best suited for non slippery surfaces, lines or objects. A different variation is best suited for slippery surfaces. It was explained very well, and a great service to those who are trying to learn how to tie this knot. Thanks Captain.

thats wrongs that.Try looking at the earlier royal navy seamanship manuals (preferable pre-1980's). hopefully you'll it find a great source for everything salty :)