I noticed an error with The Greatest American Hero Free Comic Book Day issue. You list the UPC as 78430055762000111. The actual UPC on the book is 78430055763000111 and when you scan that barcode in it comes up with totally different book. The other one I found is a missing UPC for the Mister Magic Graphic Novel Sampler (Comics Giveaway Day). The UPC for that issue is 979821727484050480.
Barcodes have been added.