and pedestal is misspelled too

there is a misspelling on level 2 of the haunted manor - partchment instead of parchment

I went back and levelled up for that encounter, then sent my stealth ranger up to open the door, and then got a surprise round where I did fog cloud with my cleric into the room to prevent them shooting, and then an entangle in the space between the doors (after my ranger backed up). Cleaned them up pretty easily.

As for the Export points in the Modules...
The first Export will come at the end of the Haunted Keep of the Slavers in the caverns area.
The second Export point will come at the end of Assault on the Slave Lords in the Slave Block through the secret door.
The third Export point will be at the end of Stockade of the Slave Lords on the 3rd level of the Dungeon where you fight Blackthorn and his troops that are abandoning the Fort.

So basically... Export at the end of...
Haunted Keep of the Slavers
Assault on the Slave Lords
Stockade of the Slave Lords

Then the Final Exit point will be at the end of In Pursuit of the Slave Lords in the Lava Cavern.

Well first answer, the goblin encounter is set up to where if you do not hit the pause button immediately, they will blow your stealth.

The "Armory" portion to the left in the intro is actually the place you can grab gear and even safe rest. That's why its highlighted in the intro. So going to the left is how you "prep" in your words for the adventure ahead if you don't like your current gear/spells.

The door closing issue, that could only be a Solasta bug specifically. I cannot program anything in there. But generally if you close a door in combat you should be able to open it on the next round with that specific character who is in front of the door.

I recommend for that 8 goblin encounter to use either a Sleep Spell or perhaps Grease or perhaps Thunderwave or Burning Hands from a Diagonal position to take out their numbers when they group up.

You don't need the export characters mod for Dungeon Maker content. When you use the final exit of an adventure (usually the creator gives you some final parting words to your successful party) you will get the Game Over screen which allows you to update (or not) your character saves to preserve their exp and loot.

Then when you start the next adventure you can select the same team (or mix it up).

I'm not the creator of these modules, so I'll let @Silverquick reply on the issues you found when playing.

Also, do I need the export characters mod to keep the party from one section to the next?

Where do we report bugs? I started the Haunting level with a fresh L1 party - its a little challenging you get thrown into fights with no prep - but thats not the problem. I cleared the level except for the one with like 8 goblins in their bedroom in the back right. I opened the door and even though stealthed went into combat instantly and 3 goblins had initiative. A crit on my tank and she's down to 2 hp. So my first move I closed the door again, thinking to be able to get set up. But now the door isn't openable again so I'm stuck in combat but can't complete it.

Looks like this is going really well Vincto, again thank you for putting it all togather.