Oh yeah, there are plenty of bugs in the original version of this game. I didn't introduce any (well, I did at one point, but was able to fix it). Here's the list of bugs that I remember. I asked my testers not to report them as errors with the translation patch, because I checked and encountered all of them in the official release, too: http://fwibby.16mb.com/
Ah, would you want me to add that list of bugs note as a link in the Game Description sector of the relevant game here? Not sure if the moderators would allow that but it can be tried. I hope that someone can add that to the
TCRF page.
I think that being able to see the credits is important, even if they're just in Japanese. The people that worked on this game deserve to have their names shown for their effort. As for translation, someone else already did that (http://www.vgmuseum.com/end/nes/b/goemongai1.htm). Note that the way their mock-ups look probably wouldn't be reproducible in the game, you'd have to make the text much smaller to get everything to fit properly.
Well, I think that translated ending credits roll page could be very useful to add on as a link to the credits fix hack page, what do you think, rainponcho?
EDIT: Well, it appears that TCRF

has a
rule stating that no information on glitches should be added there. What a bummer.

Well, I'm just going to copy the notes in the spoiler body below here so that it doesn't get lost forever. At least you can click on the 'News Articles for this Translation' text under the Links sector in the patch page above and then go to the bracketed comments text at the bottom-right corner of the front-page news for it which leads to this thread. And then see these notes.
Spoiler: Bugs in original game:
I discovered several bugs while playing this game, which are all in the offical release by Konami. Please don't report these to me, as I didn't introduce them and don't know how to fix them. Here are the ones I remember:
*Invisible option in shops
By playing around with the options after selling your last item in a shop, you'll sometimes discover an invisible third option. Selecting it does nothing. It's pretty harmless. There's a boss fight where Yae can sometimes target an invisible enemy too, but the game thinks the enemy is dead. You can also see this in action by selecting a Jutsu that's low on the list and trying to use it while that character's Jutsu is sealed.
*Palette glitch
If you try to see the "show" at the first port, but don't have enough money, the NPC will ask you if you enjoyed the show (despite never seeing it), then the screen will flash a few times. After this, the palette will be screwed up, and this even extends to the world map. I think it does change back eventually, but it's probably best not to mess around with this one too much.
*Scroll depth
In some parts of the game (it happened to me in Bear's Castle, but I saw it happen somewhere else in a gameplay video), the borders that are supposed to be off-screen can close in for some reason, and two thirds of the screen will be messed up. This glitch is pretty annoying in dungeons, as it can make it hard to figure out what you're looking at, but you can fix it by using a Mirror item (or Koban's Exit Jutsu) and resting at a nearby inn or food shop.
*Soft lock
In one of the last dungeons in the game, in the room where you find the "Pout Mask" key item, a softlock can occur if you walk up and down the left side of a small wall in that room until a battle is initiated. After the battle, all buttons will stop responding. This is related to the scroll depth glitch.
*Corrupt credits
The credits sequence, while short, doesn't display correctly. Again, the original game does this too. Someone did fix it once, but apparently it just broke the title screen instead.
*Item overflow (the house plant)
If you fill your inventory, then use the Item command in a battle, 3 or 4 extra items will be listed: at least one "HOUSEPLA", and 2 others (which I presume depend on what else is in your inventory). While the other items do exist in the game, "HOUSEPLA" is the result of the game looking at the incorrect dictionary and also getting the length of the text wrong. "HOUSEPLA" can be used as an item (it does moderate damage), but it isn't supposed to exist and causes a bit of strange text.
*Flickering tilesets
This happened to me in 2 places, most notably one of the tea houses. Depending on where you stand when talking to certain NPCs, some letters may appear to intermittently flash along with a junk tile from another tileset. Similarly, depending on where you stand when opening the menu in towns, some of the water tiles may temporarily turn into numbers as the menu comes up.
*Ebisumaru's here... in spirit
There are 2 sections of the game where Ebisumaru isn't supposed to be in the party. With certain combinations of enemies and enemy Jutsus, a dead Ebisumaru can sometimes show up in his slot during battles. You can't revive him to make him active. (WTF, Konami?)
- Mr Fwibbles