As for showing the client images, I don't think you should generally be showing them all images anyway, so that's a pretty easy solution. Why would clients even want to see every image? It's overwhelming for them, most look the same, they have no reason to care about blurry ones, etc. And it makes you seem less skilled when they realize how many are indeed blurry or weirdly exposed, etc. Even though you may have been doing everything right (e.g. maybe you are exposure bracketing on purpose and know that many will be off).
And if you don't agree to show them ALL your photos in the first place, then your issue is a non-issue... unless the photos are edgy ENOUGH that they may be pushing the limits of whatever your contract terms would be for the rest of the photos.
In which case you have two options:
1) Use a single contract that covers the broadest usage of the most sensitive photos (i.e. everything/worst case scenario, and overkill for the normal photos) you plan on shooting. With the assurance that you'll respect their wishes about what their boundaries are for different actual usages of different photos verbally. Do this if you can get away with convincing them to sign it, without making the model uncomfortable or annoyed/angry/dissatisfied. It's simplest, and it covers your ass the best.
2) If the model is unwilling to do the shoot with an umbrella contract, then its trickier. For example, if you were doing a nude shoot, some photos might be carefully posed to be tasteful and will be used for advertising or something, whereas others might be more explicit and used for a more restrictive fine art gallery or whatever only.
The safest thing to do in such a situation is to just do all of one kind of photo first, then the second kind, to make it absolutely clear and obvious. Just treat as two separate shoots, and use separate releases if relevant.
But sometimes that may be inefficient, especially with complicated sets or wardrobe or lighting changes happening where you may want both types of shot per setup. In such a situation, even if the model is aware of the different usages ahead of time and okay with both, they may not want to sign a contract that just says advertising is okay for everything and take your verbal word for it that you'll make the appropriate decisions yourself.
You could get around this by having two contracts, or two sections in the contract, with the different terms of usage, show the model both ahead of time and explain, and then clearly verbally indicate during the shoot whenever you are switching from one type of photo to another, allowing the model the opportunity to ask questions, monitor their own posing as may be appropriate, etc. Maybe even audio record (with notification) in case there are squabbles later.
But really, 95% of the time, you can and should avoid any such thing, and try to only do blocks of photos in a row that all fall under one set of terms.
