My local supermarket had a 30% discount on all toys and games in store today. Dayum. Couldn't resist, had to complete my series 4 (i only 2 so far, which I bought overpriced at the NY Lego Store) - Viking was one of the last I found, most others were easy to feel up, but didn't find a Frankenstein monster. Had to feel up about 80% of the whole box (which seemed mostly complete but I didn't count) until I found the Viking.. felt all the rest, and there was a bunch I couldn't recognize quickly, put them aside... I thought I'd read here the Frankenstein's *head* was bigger than usual, so that's what I was searching for - of course now I see it's a regular head with a "top".
If anyone could post pictures of the monster's headgear alone under a few angle, that'd definitely be a great help to figure out what to look for. I found this - http://www.bricklink.com/catalogItemPic.asp?P=x231px1 - and am pretty sure I felt something like that at some point - but the pictures of this Frankenstein don't seem to show studs on the sides ?
edit: Ha, bricklink has it, of course: http://www.bricklink.com/catalogItemInv.asp?M=col055 - additional pictures still appreciated, but I'm pretty sure I've felt something like that now that I see it independently, just had no idea what it was.