Update: the official DCA HH errata is http://grfiles.game-host.org/files/DCAHHerrata.pdf. Most of the items mentioned in this post are fixed. I bolded the ones that don't appear to be fixed.
Battlesuit: The Battlesuit has Dodge 9 and Toughness 12, which is over his PL limit since the archetype is PL 10.
Wonder Woman has Flight 11, which is incorrectly listed as 2,000 MPH; it should be 4,000 MPH going by the standard on other characters, which seems to be that it's your distance covered single-moving for an hour.
Wonder Woman's Bracers are only worth 8 pp, so they should only get 1 pp back from Removable (p 235).
It's hard to understand what construction Wonder Woman's Lasso is.
Note that Removable happens to be done in a somewhat strange way that can lead to an Easily Removable device with 1 pp more put into it costing 1 pp less overall. Such is the price of not using decimal points!
Superman does not have the Interpose Advantage, despite being mentioned as an example of a character with this advantage in the Advantages chapter!
Superman has Acute Hearing as a Super Sense, but Hearing is already Acute (apparently this refers to his super-sense hearing)
The Powerhouse archetype has a lifting capacity of 1,600 tons, which is described as enough to lift the Leaning Tower of Pisa or an entire train. The Leaning Tower of Pisa weighs about 16,000 tons. http://en.wikipedia.org/wiki/Leaning_Tower_of_Pisa. The 2e core book (p 37) described a freight train as requiring about a 16,000 ton heavy load. So it looks like someone accidentally added a zero when describing how much the Powerhouse can lift.
It's also incorrect to describe the Powerhouse as able to lift 40 times as much as the Paragon: "whereas the Powerhouse can lift forty times that amount"; the Powerhouse can lift only four times as much as the Paragon.
Under Sleight of Hand (pg 64), it says that Escaping a Grab is an Acrobatics or Athletics check. However, under Escape on page 176 it says you can use an Athletics or Sleight of Hand check. Clearly one of these passages deserves errata.*
In general, modifiers are not optional, so Partial modifiers are by no means obvious how to apply in many circumstances. This needs rethinking.
The Partial area extra needs to be redone because it isn't balanced: viewtopic.php?f=27&t=37648
It is completely unclear how Multiattack extra's "hit multiple targets" function works.
Shapeable also needs errata:
UnkindMirror wrote:Narmio wrote:Just as an aside, the Shapeable area must be a maths error. It provides a 30 cubic foot shapeable area. In real money that's slightly less than a cubic meter, or roughly the size of a large bathtub. Whoops.
On the other hand, since Shapeable also makes no mention at all of how thin one can stretch its volume, nor states how much volume is necessary to affect someone, it would seem that there's nothing in the way of thinning it to a hair's breadth and razor-floss an entire battlefield's worth of enemies with it.
Needless to say, that one requires errata.
Pg 94- Dazzle, one too many "t's":
Two degrees leave it disabled (–5 penalty) while tthree degrees leave the sense unaware
It's strange that the DC 15 Athletics check for +1 ground speed isn't mentioned under Move on page 176, since players of characters without ranks in Athletics may never even know that the running rule exists (it's listed in the index at the back, but they'd have no reason to look it up). I hope this is changed in the M&M 3e printing.
Similarly, on page 48 Strength mentions that it adds to "How far you can jump." This should be removed as a separate item, as it's redundant with adding to Athletics skill checks; Jumping distance is based on Athletics, which is based on Strength. However, adding a reference to the fact that Athletics determines how far you can jump would be quite handy. E.g., "Athletics skill checks (which determine how far you can jump)."
Black Canary's Affliction powers don't list what they are resisted by. Clearly it's Fortitude, but this still needs errata.