In Devarim 9:7, Moshe reproves Bnai Yisrael by stating that you were rebellious from the time you came out of Egypt until you came to this point. In verse 8, he starts by focusing on what happened at Horev (Mt. Sinai) with the sin of the Golden Calf.
From there until verse 21, he describes what happened at Horev. In verses 22-23 he describes some of the other rebellious events. (Sounds OK, to me, b/c the intro verse was listing the rebellious events in general>) Verse 24, he makes a "summary" statement.
Then, it seems Moshe reverts back to the Horev event from verses 25 - 29, he goes back to HOrev. It continues in the next chapter from 10:1 - 10:5.
Then from 10:6 - 10:8 there seems to be verses that seem completely disconnected from the event at Horev and it doesn't seem to be any type of "reproof". It talks about Aharon's death and the priesthood going to his son Elazar and how the Levi'im didn't get a portion of land.
Finally, from 10:10 - 10:11 we are back to what happened at Horev.
Essentially, there are two interruptions.
The first one seems to be related to Moshe's reproof, so it has direct relevance. But, why not move that section to the end after discussing the events at Horev?
The second interruption puzzles me. I don't understand at all why it's there.