No, right now I am the only one who approves new content, even in languages that I am not familiar with. Reviewing every command in every cheatsheet would be a very difficult and time-consuming process.
In general, I have not noticed many inaccuracies in the cheatsheets other than typos or small errors. If there are errors, then hopefully users will contact the author and he will update it or issue a new version.
As I've mentioned in other comments, I also hope to add either community voting or popularity indicators to help identifiy the best (and presumably most accurate) cheatsheets for each language/tag.
In general, I have not noticed many inaccuracies in the cheatsheets other than typos or small errors. If there are errors, then hopefully users will contact the author and he will update it or issue a new version.
As I've mentioned in other comments, I also hope to add either community voting or popularity indicators to help identifiy the best (and presumably most accurate) cheatsheets for each language/tag.