Is there some place on the internet that I can Shepardize case law.

I can't think of any and this Q & A forum isn't for information on topics like that. Good luck with your case!

If your review was false the attorney might be able to sue you. You should consult with an attorney in private regarding this matter.

Is this "reverse passing off"? Buying several products, combining together into one, using own label?

Based on the information you've provided you should be finding with mixing the content. However, if you plan to use the other company's logo in...

Who would I speak to about permission to dress as a Disney princess?

I am sure the kids will be happy to see you. You should contact the Disney Permission Department. Good luck

You should post this question under criminal law / fraud.

If a fraud crime is committed in another state with my information, which state has jurisdiction over the case?

You should try posting this question under criminal law / fraud.

How can individuals and small companies afford to litigate patent infringement against big companies and Fortune 500s?

All lawyers don't ask for payment upfront. There are some that accept cases on a contingency fee retainer.

You can try to protect the recipe as a "trade secret" ... You should consult with an attorney in private for a full analysis.

Based on the information you've provided you should get a new logo. You don't want to be liable for infringement.

How does an established clothing company receive permission from a celebrity to have their face used on one or more items?

You would need to contact the celebrity's representative. If you are able to negotiate a deal you need to make sure everything is in writing and...