The music played at the beginning as the capital ships approach one another is excerpted from Wojciech Kilar's score for Bram Stoker's Dracula (1992), specifically the track "Vampire Hunters."
I lost R2 in the field.
Obi-Wan Kenobi: Well, R2 units are a dime a dozen. I'm sure you'll find a suitable replacement.
Anakin Skywalker: I could take a squad out there, track him down.
Obi-Wan Kenobi: Anakin, it's only a droid. You know attachment is not acceptable for a Jedi.
Ahsoka introduces the new R3 unit to Anakin as the "newest" model of astromech droids. However, in Star Wars Episode II: Attack of the Clones, Obi-Wan uses an R4 unit on his missions to Kamino and Geonosis which takes place before the events of this episode.