I've only watched about half of the movie but here's a few things I want to address...
"Feed a fever, starve a cold."
That's the wrong way around. It's "feed a cold, starve a fever."
Now was this lazy writing or did Nam-Vet Priest deliberately get it the wrong way around because he somehow intuited that Fr. Doug was now part dinosaur? Because dinosaurs were cold blooded and their metabolism works in almost the opposite way to ours. So by switching around the adage was Nam-Vet Priest letting slip that he knew Fr. Doug is part reptile or was it caused by the PTSD he no doubt suffered after his special lady was liquidised all over his face in Nam?
"Dinosaurs never existed and even if they did I don't transform into one!"
Besides being an amazing line of dialogue this kinda implies that Catholics don't believe in dinosaurs which we all know isn't true. A mistranslation in the Bible leads many people to think that Jesus had a problem with Tax Collectors whereas the truth is he had issue with T-Rex Collectors - the big game hunters of their day. The Confessional
When Fr. Doug kills the pimp in confession those are the roomiest confessionals ever. There's a standing lamp behind the pimp! I'm only used to the confessionals I know from Ireland and maybe everything is bigger in America but standing lamps seems a bit excessive even for you guys.
Other quick things:
in Nam did many US soldiers wear jeans and carry shotguns?
The drinking from chalices was great.
If Nam-Vet Priest tried his hand at the clergy AGAIN after coming home then it meant he was already in a seminary (or Priest College as it's properly called), left, met a girl, went to thoroughly convincing Vietnam and then after his sweetheart phase changed all over him decided to go back home and give being a priest another go.
Finally the priest outfits are the shoddiest pieces of shit ever. Look at that collar - it's like someone stitched it while wearing the Dinosaur costume!