[im3w1l-alt]

I think the mockup emphasises the original tweet too much and the apology too little.

Suggestion: put the apology first. Use black color for apology, faint gray for original.

[npunt]

Good idea, I was trying to use existing Twitter designs as much as possible but agree emphasis is lost. See the top image in the Follow-ups section where the mistake is represented atop the tweet for something more along what you're thinking.