The pitfalls and errors discussed in this article, which can be encountered when writing React code, include subtle defects such as render non-boolean values, comments inside JSX expressions, and rendering a lot of nothing. To detect these issues before they create obscure bugs, tools like SonarLint can help by providing warnings and explanations for the detected problems. Additionally, Eslint has rules available to detect some of these issues, but may require additional setup or configuration. By using SonarLint and Eslint, developers can write clean code and prevent issues from arising in the first place.