1. Reference EVERYTHING you can in your works if it is relevant.
Use a computer program for some of your work? Make sure you cite the program in some way. Use some data as a key part of your analyses? Cite the source of the data. (For example, in my area people are really bad about citing genome data). Got an idea from some paper about how to do an analysis? Cite that paper. I find it absurd that some journals arbitrarily restrict the number of citations one can use in a paper. Sure, don't overcite things that are trivial. Don't overcite yourself either. But cite everything that matters.
2. Write complete and detailed Acknowledgement sections.
Describe in as much detail as possible whomever contributed in some way to the work. Sure, in printed papers a long Acknowledgement section may be a bit much. But this is the web era. Many journals already have online methods sections that are longer than those in the printed version. It is time to do the same thing for Acknowledgements.
3. Annotate in detail the contributions of authors on a paper.
Most journals (at least in the sciences) now have a section on "Author's Contributions" although some of them have arbitrary categories one is supposed to use. Don't follow those silly categories. Write a section that details what authors ACTUALLY did and put it in your paper. Many journals will allow one to replace the arbitrary categories with one's own text.
It is by detailing the actual contributions to one's work that we can really show the spirit of Thanksgiving in academic work.