Yeah, I've read that book several times. I never saw "Here Come the Brides" and had actually never heard of it before reading the book. So that part wasn't what annoyed me. It was the Doctor Who reference (the race who live in the "constellation of Kasterborus", aka the Gallifreyans) that annoyed me, since the in-universe physics and Earth history of Doctor Who and Star Trek are completely incompatible.
It annoyed you, but was it enough to ruin the novel for you and wish you'd never bought it? It was an extremely minor part of the book. And what about the Star Wars and (original) BSG references in that novel? I suspect that, like me, you never even noticed them. Here is the full list:
Several other television characters appear throughout the book. In San Francisco, Spock plays chess with a gunfighter dressed in black who matches the description of Richard Boone's character Paladin in the TV series Have Gun Will Travel (pages 180-182). Star Trek creator Gene Roddenberry is credited for writing 24 episodes of this series.
The British TV series Doctor Who is referenced at least four times: the Fourth Doctor is described on page 13,Metebelis crystals from the serials The Green Death and Planet of the Spiders are mentioned on page 57, the Second Doctor is described on page 154, and Kirk recalls legends of a planet of stagnant time-travellers in the Kasteroborous galaxy on page 200.
Numerous other Western and science fiction characters make cameo appearances throughout the book. Page 13 features Han Solo ("a scruffy-looking spice smuggler") from Star Wars as well as Apollo and Starbuck from Battlestar Galactica ("a pair of brown-uniformed pilots from some down-at-the-heels migrant fleet"). Pages 153-154 feature Little Joe Cartwright and his brother Hoss Cartwright from Bonanza ("a good-looking boy in the dusty clothes of a trailhand just in from Virginia City, and his oxlike older brother") and Bret or Bart Maverick from Maverick. Emperor Norton and his dogs also appear. Matt Dillon (Gunsmoke), Lucas McCain (The Rifleman), The Rawhide Kid (Rawhide), and the Man With No Name also make appearances.
And by that same token, how do you feel when places or people from Deep Space Nine
are referenced in TOS novels?