I've been re-reading the Symphony, and something suddenly struck me. And I quote...

"...Corwin had carefully maneuvered his opponent
onto Kenmore Boulevard, a broad, flat street which, from here, ran as
straight as an arrow to the shore of Lake Daniels. There was nothing
between Big O's helmet and the horizon..."

...there's a Horizon inside a Dyson Sphere?

Just a little nitpicking, I suppose but it had me scratching my head for a bit.

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"It's difficult keeping up with the cross-continuity, but I think Cosmouse just gave The Saturnian Scraphunter his Ultimate Pacifier to use against Galactapuss..."