This is surprisingly well made. The direction features quite a bit of camera movement for a quickie, the photography boasts some moody shadows and interesting wide angle lens effects, the swamp graveyard set is cool, and above all it's well acted--with Moreland doing his thing but the rest of the cast giving their all. And the music score is also well done not too much music either--not the wall to wall stock music approach in this film.
There is a lab/montage scene that is pretty elaborate and well done. There is another nice tidy montage to show time passing at a dinner party which has a funny pay off line and the last shot has an unusual pay off as well.
Carradine fans will enjoy his bug eyed entrance into the film but for the most part he plays it pretty straight/sober and he has a kind of memorable exit from the film--not to give it away.
The intentions I guess are mainly comic though it's not all that funny you almost wish they had just gone for serious horror yet it isn't campy for the most part and it's an all professional job.
The script holds it back from becoming above average though it is above average in all departments for this low budget genre of the era. Even the sets though not memorable don't look impoverished and the lab has quite a bit of gear in it.
The direction really impressed me with always making the most out of every situation--within the restricted scale of the movie.
One interesting thing, and you know this right away, is Nazi scientist Carradine kills and zombifies his wife, she does occasionally speak and they do a kind of interesting hollow sound to her voice. I think this film may be the first of the Nazi dead army plot movies tough it's certainly not the best one.
All said and done on a script level you pretty much get what you'd expect which isn't much but the movie almost won me over and fans of this era of genre films could do a lot better but you could do a lot worse as well.