Almost there.

my %h = ();
foreach(@_) {
   $h{something} = $_; # changes the %h above every time
   push @something, \%h;  # puts the %h into @something multiple times
+...
}
[download]

my %h = ();
foreach(@_) {
   $h{something} = $_;    # changes the %h above every time
   push @something, {%h}; # copies the accumulated changes into @somet
+hing
}
[download]

foreach( @_ ) {
    my %new_hash = (something => $_ ); # make a new hash
    push @something, \%new_hash; # push it onto the stack
}
[download]

foreach(@_) {
    push @something, { something => $_ }; # make a new hash and push i
+t onto @something!  Magic!
}
[download]

For all the details of all the nuances above, look at perldata and perlref. I re-read perlref twice a year or more. I frequently find something new.