Create a level 2 section in your notebook called Verify Dataset.
Write code to check each of the following. Don't over think this bit. Each check is at most one/two lines of code:
df_authors.author is a unique identifier.df_authors.df_comments.id is a unique identifier.df_authors.author.df_submissions.id is a unique identifier.df_authors.author.df_subreddits, the number of moderators listed in all_mod_names matches count in all_mods.