"anbrüllen" is a stronger, more augmenting word than "anschreien", usually used by the target person, not the yelling one. In combination with "um Verzeihung bitten", this sentence would be very submissive. You can imagine an oppressed wife using it to demonstrate acceptance of her husband's rule and dominance.Ich bitte um Verzeihung, dass ich dich angebrüllt habe.
Maybe it sounds a bit more formal?
In spoken language, the "dafür" is usually omitted, that's why I did not think about it.Ich bitte um Verzeihung dafür, dass ich dich angebrüllt habe.
No. They changed it back to lower case. Except now, the infinitive is spelled as one word, leidtun (not leid tun as before 1996). But all the inflected forms are like before 1996.Unfortunately 'Leid' seems to be the correct form now.