I know that most of these will probably look too obvious to the veterans.

But definitely not obvious to remember. None of the first three (I didn't read past these) are listed in perltrap, and I don't remember seeing them listed as traps in one place like that

See also Common Beginner Mistakes, Common Beginner Errors in Perl, NO, THAT'S WRONG! Common Perl Pitfalls, Modern Perl