People getting lost in rambling trains of thoughts, especially for the purpose of dropping in a bunch of canon connections that don't have much if anything to do with the story being told. It's not necessarily
unrealistic for people's minds to wander, but it's often distracting, and it becomes unrealistic when a lot is packed into a very short time period, like during a conversation or even a battle. (Mitigated if the character missed something because they zoned out.)
Feel a little awkward using this example with Greg Cox on the thread, but it's the one that jumps immediately to mind. Sorry, Greg. From "Q-Zone":
"That situation may have changed," Faal announced with what was to Troi a palpable sense of pride. Typical,she thought. What scientist is not proud of his accomplishments? The map of the galaxy flickered, giving way to a photo of a blond-haired woman whose pale skin was delicately speckled with dark red markings that ran from her temples down to the sides of her throat. A Trill, Troi thought, recognizing the characteristic spotting of that symbiotic life-form. She felt a fleeting pang of sadness from the woman seated next to her and sympathized with Beverly, who was surely recalling her own doomed love affair with the Trill diplomat Ambassador Odan. Troi wasn't sure, but she thought she sensed a bit of discomfort from Will Riker as well. A reasonable reaction, considering that Will had once "loaned" his own body to a Trill symbiont. She was relieved to note that both Will and Beverly swiftly overcame their flashes of emotion, focusing once more on the present. They acknowledged their pasts, then moved on, the counselor diagnosed approvingly. Very healthy behavior.
Worf married a Trill, she remembered with only the slightest twinge of jealousy. Then she took her own advice and put that reaction behind her. I wish him only the best, she thought.
"Some of you may be familiar with the recent work of Dr. Lenara Kahn, the noted Trill physicist," Faal went on.
Feels like a
lot of rambling thoughts going on in the space between two sentences in a briefing based on the somewhat flimsy connection that they're looking at a picture of a Trill. It could be that these paid off more than I recall, but they felt more like padding than anything connected to the larger story.
(Greg, FWIW, I generally enjoy your writing otherwise, and I consider this a fairly common issue in tie-in fiction.)