The following HAVE BEEN ADDED, after Nancy Kotary's entry:

To Genevieve d'Entremont, for heroic typesetting far beyond
the call of duty.

To Lucie Haskins, whose superb index so elegantly complements
the original manuscript.

The following HAS BEEN ADDED before Chris Dever's entry:

To chromatic, for his rapier wit, for unveiling the mysteries of
testing, and for his invaluable assistance in getting the message
out to the wider Perl community.

"...ivory-tower theories on how code ought be created."

Should be: "...ought to be created."

"But remember that each of piece of advice"
should be:
"But remember that each piece of advice"

"Note, however, that the contents of paragraphs..."

replace "contents" with "comments"

my $estimated_nett_worth;
should be:
my $estimated_net_worth;

In parenthetical comment, 'mby' should be 'myb' ('maybe', disemvoweled)

The example:
$escape_seq = "127�06�30Z"; # DEL-ACK-CAN-Z
should be:
$escape_seq = "177�06�30Z"; # DEL-ACK-CAN-Z

Change:
If you decide not use the Readonly module ...
to:
If you decide not to use the Readonly module ...

replace
atomic weight values
by
atomic number values

The problems described earlier under "Localization can also crop up...

should be:

The problems described earlier under "Localization" can also crop up...
^

the word "prepenultimate" should be "antepenultimate"

"...then see if the resulting file exists. If it does, then..."
should be:
"...then see if the resulting file exists. If it doesn't, then..."
^^^

iab papp ^]:r ...
should be
iab papp ^[:r ...

"expected processing delays," should be "unexpected processing delays,"

...no need for (expensive) hash loop-ups inside the loop.
should be:
...no need for (expensive) hash look-ups inside the loop.
^

$overall_probablity
should be:
$overall_probability

Barewords is forbidden under use strict, so...

NOW READS:
Barewords are forbidden under use strict, so...

... # Maybe the same (if currobj() already declared),
should be
... # Maybe the same (if curr_obj() already declared),
^

return $num if $prev_found;
should be
return $num if $prev_odd_found;
^^^^

Replace
Chapter 2
by
Chapter 3

"slurp()" shouldn't be line-broken between the parentheses

Nor will this version allow an extra % or & in the source.

NOW READS:
Nor will this version allow an extra % in the source or & in the data.

"loader_header_from()" should be "load_header_from()".

The 3rd line reads:
... it can still better to use croak():
which probably should read:
... it can still be better to use croak():

the dashes on "--input" NOW APPEAR asnon-breaking so they don't word-wrap.

The two occurrences of "=>" should each be "->" .
So the line should be:
= exists $arg_ref->{vagueness} ? $arg_ref->{vagueness} : 1;

In fact, it is correct in the example file:
./code/ch15/Ch15.034_Best_Ex15.5

Second sentence reads (underline emphasis mine):

"If two or more classes in the _name_ hierarchy do happen to have attributes of the
same name, the constructor will need two or more initializers with the _name_ key --
which a single hash can't provide."

It should read:

"If two or more classes in the _same_ hierarchy do happen to have attributes of the
same name, the constructor will need two or more initializers with the _same_ key --
which a single hash can't provide."

"Class::Std::Utils" is incorrectly written as "Class::Std::Util" in the paragraph in
the middle of the page (just above the extract_initializers_from() function).

There is an asterisk on the 3rd line of the last paragraph of page 385, but the
corresponding footnote is on the next page.

The footnote referenced is on the next page.

("to" instead of "do")

"Better still, Module::Starter has a simple plug-in architecture that allows you do
specify how it creates each new module..."

should read:

"Better still, Module::Starter has a simple plug-in architecture that allows you to
specify how it creates each new module..."

"... your /t directory ..." should be "... your t/ directory ..."

sub dump_a
should be
sub dump_at

as referenced in 3rd paragraph line 2;

"use strict never gets the change to"

replace "change" with "chance"

the last two lines:

<section name="verbose"> <!-- Report</comment --> </section>
<section name="log"> <!-- Report every step --> </section>

should be:
<section name="verbose"> <!-- Report every step --> </section>
<section name="log"> <!-- And log every transaction --> </section>

"behaviour any type of variable"
should read
"behaviour of any type of variable"

...summarize the results with dproffpp... -> dprofpp

Change the line:

Readonly Creates read-only scalars, arrays, and hashes (see Chapter
14) 1.03 or later

to:

Readonly Creates read-only scalars, arrays, and hashes (see Chapter
4) 1.03 or later