Ask people what they were assessing on a first date and the two answers rarely line up. Men tend to report on how it felt overall. Women tend to report on specifics, most of them small, most of them collected while the other person had no idea an assessment was underway.
How He Speaks to the Waiter

This comes up more than anything else, and it is not about being charming to staff. It is about whether his manner changes when he is talking to someone he has no reason to impress. A man who is warm across the table and curt when he orders has just shown two versions of himself in ten minutes.
Whether He Asks Anything Back

Not whether he talks a lot, which is usually nerves, but whether any question comes back the other way. Plenty of first dates are one person answering and the other person waiting for their turn to speak. The imbalance is obvious from one side of the table and almost invisible from the other.
His Hands

Nails, mostly, and whether they have been dealt with. It reads as a proxy for whether he looks after himself when nobody is checking, which is why it carries more weight than it deserves. Men almost never mention noticing this on anyone.
What He Does With His Phone

Face down and untouched registers. Face up on the table registers differently, and glancing at it mid-sentence registers worst of all. Nobody says anything at the time, and it goes in the file.
How He Talks About an Ex

First dates raise the subject more often than people expect. What gets noticed is not the detail but the temperature, and specifically whether every previous partner turns out to have been the problem. One villain is a story. A run of them is a pattern with only one common element.
Whether He Remembers What She Already Told Him

Anything mentioned in the messages beforehand counts. Referring back to the job, the trip, the sister’s wedding shows he read it rather than skimmed it. Asking a question she has already answered in writing shows the opposite, and it is noticed immediately.
The Shoes

Not whether they are expensive, which nobody is checking. Whether they have been cleaned. It is read as evidence about effort, on the basis that a man who thought about his shoes thought about the evening.
How He Reacts When Something Goes Wrong

The wrong order, a long wait, a table that was not held. First dates are full of small friction, and how he handles it is the only unscripted behaviour available on a night where everyone is performing. This is the single most informative moment of the evening and most men do not register it as a moment at all.
What Happens at the Bill

Less about who pays than about whether it becomes awkward. Fumbling, announcing, making a point of it, or going quiet all get noticed. Handling it without ceremony is the thing people describe afterwards as confidence, though what they are really describing is not making it anyone else’s problem.
Whether He Checks She Got Home

A message an hour later saying nothing more than “home safe?” carries a surprising amount of weight. It costs nothing and it lands as the difference between someone who enjoyed the evening and someone who was actually paying attention. Its absence is noticed even when the date went well.
Why the List Looks Like This

Almost everything above is a proxy for the same two questions, which are whether he is consistent and whether he is paying attention. None of it is a rule and men notice their own set of things, usually a different set. The gap is less about who is more perceptive and more about what each side has learned to look for.