The white sword is where a door repair was in the first/second quest. It was "fixed" .
The map in Level 3 is southeast of the compass
The compass in Level 4 is 2 screens south of the top
You find the whistle in Level 3, that's why you get trapped in the Digdogger room

I'll fix typing mistakes last, but if the original game could misspell peninsula then I could misspell stuff too

It's unpassworded so you could open it up.

I'll work on fixing bugs