The official piece count on the Bat-Pod page says 311. This is as per the box but an actual inventory take of the set shows there are 338 pieces, and the BrickOwl inventory reflects this. Guessing the boxes were printed and then a design change happened. The BrickOwl inventory page says "there are 311 pieces in this set" which is clearly referencing the official piece count rather than the actual count of the displayed/stored inventory - this may be intended or may be a bug, thought I'd mention it.
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For instance, saying "This is the inventory, and it contains 328 parts." when only 1 part is in the BrickOwl inventory looks a bit silly.