Warn me when I'm using -h instead of --help. When writing persisted scripts it's often more descriptive and self documenting to use long form flags[0] when a tool gives you both options.
Warn me when I mix using "-p 8000:8000" and "-p=8000:8000". I know it's technically not possible to give a definitive answer here because supporting spaces vs equals comes down to the CLI tool itself but you can pick up when you mix the 2 styles and leave it up to the script author to pick a style and stick with it when possible.
I do a lot of shell scripting in my day to day (ops, etc.) and it's always a manual process to give feedback on code reviews when others contribute patches or introduce new scripts.
[0]: https://nickjanetakis.com/blog/when-to-use-long-word-or-shor...