Dear E.:

You wrote:

When writing a business document such as a sell sheet, should I include registered trademark symbols and the like after products and services? Or, is that unnecessary?

I guess that would depend on the situation. Certainly anything in-house or with a trusted customer, it would probably not be necessary. However, if you want to keep on the safe side, you certainly could. That is more of a legal question than a grammar question. There is certainly nothing wrong with it.

Dear E.:
You wrote:
James, here’s some more info so you can make an informed decision.
I am writing a video game sell sheet, which will explain my game concept to a major game publisher. It will be pitched in an effort to get my game greenlighted. That said, should I include registered trademark symbols after words such as NHL and Stanley Cup? Do you know? Or should I consult a lawyer?

It probably would not hurt to consult a lawyer. I do not think at this point in the production that it would make any difference. After all, newspapers use such terms all the time. However, once it goes commercial, you will probably have to get some kind of permission. How many times in January in America do we hear “the big game” because an advertiser could not get or would not pay for the permission to use the words “Super Bowl.”