When you update your blog post, use the word "UPDATED" clearly (in capitals and in red for example). The date should also be added, if relevant.
Example:
UPDATED: 1 August 2010 [summary of what you changed]
Figure: OK example – Although Peter has the right idea, he needs to think more of a global audience - See live
✅ Figure: Ultimate example – Mike has gotten into the swing of things - See live
You should also apply this technique to youtube videos you record too.
✅ Figure: Good Example - Following up on bug video makes it clear that the bug was fixed quickly